HAWTHORN WOODS, IL. — Wilmette’s Philip Arouca hadn’t done much in professional golf — until he teed off in the 62nd Illinois Open at Hawthorn Woods Country Club. Then he couldn’t do much of anything wrong.

Arouca, 26, opened 65-67 in the 54-hole tournament, then held off a challenge by Libertyville’s Michael Schachner to take a three-stroke win and claim the $15,500 first prize. Arouca posted an 11-under-par 202 and became the second New Trier High School graduate in a row to win the championship. Eric Mierdierks missed the cut in his title defense..

Though he blew a six-stroke lead in the final round, Arouca never trailed in his fourth appearance in the tourney. He had missed the cut in his previous two tries at Hawthorn Woods and appeared to be folding when his tee shot at the 12th hole sailed out of bounds.

“That could have been a blessing in disguise,” said Arouca. “Something clicked in my swing after that.’

The OB shot created a three-shot swing and lifted Schachner into a tie for the lead, but Arouca reclaimed the top spot with a four-foot birdie on the next hole and led by himself the rest of the way.

Doug Ghim, 15, of Arlington Heights became the youngest player to ever compete in the championship. He finished at 7-over-par 220 and tied for 37th.

John Seehausen, 67, of Inverness was the oldest player among the 156 starters. He was medalist in a qualifying tournament at Inverness after shooting a 69 on his home course. He showed that was no fluke by also posting 69 in the first round at Hawthorn Woods before finishing 78-80.

Mike Small, the University of Illinois coach, was hoping to win the tournament for the fifth time and tie Gary Pinns for most Illinois Open titles. Small, who last won the Illinois Open in 2007, finished in a tie for 13th at 1-over 214.

ROMEOVILLE, IL. — Wheaton’s Jenna Pearson became the first golfer to win the Phil Kosin Illinois Women’s Open as both an amateur and a professional when she captured the 17th staging of the event at Mistwood in Romeoville.

Pearson, in her fourth year as a touring pro after a solid collegiate career at South Carolina, posted the low score of the final round, a 68, to finish at 1-under-par 215 for the 54 holes — two strokes better than Sterling amateur Ember Schuldt, a University of Illinois golfer.

Since turning pro Pearson has played on both the Duramed Futures and Canadian tours. She has also finished in the IWO’s top 10 each of the last five years. She won the tournament for the first time as an amateur in 2006 and was low pro the following year, when her title defense was spoiled by a loss to Libertyville amateur Nicole Schachner in a 10-hole playoff.

As was the case in her previous IWO appearances, Pearson had her mother Laura as her caddie. Leaderboards being scarce at the IWO, they were surprised to find Jenna in a tie for the lead after the 15th hole of the final round.

“At the turn I was still three-four shots back,” said Pearson. “I figured a couple girls behind me might make some birdies coming in, and I had better focus.”

Pearson did just that. She hit a 6-iron at the 152-yard 17th hole to four feet from the cup. Then, after a long talk with her mother, she rolled in the birdie putt to take sole possession of the lead.

There was more mother-daughter debate on the par-5 18th after Pearson put her drive in the right rough. She was tempted to go for the green from 190 yards out, but her mother thought better of it. In this case mother knew best.

“I had a really bad angle. I would have had to hit a big cut around the trees,” said Pearson. “She would let me go for it.”

So, Pearson played her second short of a creek fronting the green, then chipped to within a foot of the cup.

“Definitely the kind of birdie putt I wanted,” she said. It dropped, giving Pearson the biggest first-place check in IWO history — $5,000 from a $17,000 purse.

MEDINAH, IL. — The 92nd Chicago District Amateur took an unusual twist. The championship match was played on a different course than all of the preliminary competition, but no one was complaining.

Medinah Country Club played host to the tournament, and the 36-hole stroke play qualifying competition was to be played on its Nos. 1 and 2 courses. The match play portion, to determine the champion, was scheduled for just the No. 1 layout, with the club planning to keep the famed No. 3 course rested for the 2012 staging of the Ryder Cup matches.

After the stroke play qualifying for the 47 finalists, however, Medinah officials offered No. 3 for the final match. That layout had undergone another major renovation since hosting the 2006 PGA Championship in preparation for the Ryder Cup.

“It’s in the best shape it’s ever been in during my eight years here,” said director of golf Mike Scully. “Curtis (Tyrrell, Medinah’s director of grounds) has done a terrific job.”

Scully thought the chance to play No. 3 would be “an incentive” for the 16 players left in the tournament, and he was right. Though neither of the finalists had ever played the No. 3 course, both welcomed the change in venue for their 36-hole showdown in the oldest amateur tournament in the Midwest.

“I didn’t care if I’d seen the course or not,” said Bloomington’s Kyle English, who emerged the champion. “Playing Medinah No. 3 was very special. It was in perfect shape and had perfect greens. We got a little preview of the Ryder Cup. It was a lot of fun out there.”

Runner-up Andy Mickelson, from Lockport, agreed.

“I was excited when the chance (to play No. 3) came up,” he said. “It was awesome. I loved playing that golf course. I don’t get a chance to do something like that very often. It was a thrill, an absolute treat.”

English, 20 and a junior at Florida Gulf Coast University, and Mickelson, 29 and the merchandise manager for a Lisle packaging company, waged one of the most competitive finals in the tourney’s rich history. English, 2-down with four holes to play, fought back to force extra holes and then won it with a par when the players played the course’s No. 1 hole for the third time.

That hole wasn’t friendly for Mickelson. He put all three of his approaches in the same front bunker, making bogey on the first and third attempts at the 383-yard par-4. The second was telltale.

“It’s a tough golf course,” said Mickelson. “You had to be so exact, so precise. In the playoff, if I’d hit my (approach) just a yard further it’s two feet from the pin instead of going down into the bunker.”

Instead, Mickelson ran his bunker shot five feet past the cup and missed the par-saver. English two-putted for par from 15 feet and the 8 hours 42 minutes of competition were over.

A month earlier Mickelson and English were in a duel for the Joliet Amateur title.

“We played in the last group and were in a playoff there, too, but I was able to beat him,” said Mickelson. “He’s a tough player. He’s younger than I am and hits it further than I do, so I’ve just got to find a way to get it into the hole.”

Mickelson did that until the very end. English was 2-up after three holes, but Mickelson won three times between holes 4-7 to take the lead. He was 2-up after another good stretch in the afternoon round before English mounted his comeback. He was 1-down after making birdie at No. 16 and a par on 18 was good enough to win that hole after Mickelson slipped on a 6-iron approach, leaving him a 90-yard third shot on the par-4. English was left 70 yard for his third after his drive found a bunker, but he saved par from five feet after Mickelson missed from six.

The switch in courses worked against Mickelson, who made 11 birdies in winning his quarterfinal and semifinal matches the day before on the No. 1 course.

“I felt really comfortable on No. 1. It had the same look as Joliet Country Club, where I’m a member,” said Mickelson. “It was a solid test of golf and neutralized the bombers, being 6,800 instead of 7,200 like No. 3. But I would never have given up the opportunity to play No. 3.”

Mickelson, who qualified fifth, eliminated medalist John Watson IV of Conway Farms 3 and 2 in the semifinals. Watson paced the 16 match play qualifiers with a 5-under-par 138 over the Nos. 1 and 2 courses. English, who plays out of Crestwicke Country Club and and tied for 11th in stroke play qualifying, eliminated No. 2 seed Casey Pine of Prairie Vista 2 and 1 in the semis. English’s three matches prior to the final all ended on the 17th hole.

The four semifinalists qualified for the 81st Illinois Amateur, to be played at Glen Oak in Glen Ellyn from Aug. 9-11.

OLYMPIA FIELDS, IL. — Ariya Jutanugarn was the easily the medalist at the 63rd U.S. Junior Girls Championship at Olympia Fields, but she was leery about getting into a match play situation with the title on the line.

“I don’t like match play, because you don’t know when you’re going to lose,” the 15-year old from Bangkok, Thailand, said.

This wasn’t her first time as a medalist, either. She also led stroke play at the U.S. Women’s Amateur Public Links Championship, but wasn’t as good in a match play situation there.

As it turned out, during a week dominated by sweltering temperatures, Jutanugarn had little to worry about. She emerged as only the 16th medalist in the tourney’s 63 stagings to claim a victory, and it was her first U.S. Golf Assn. title.

The heat — temperatures in the 90s — was an ongoing concern, but Jutanugarn was a cool customer throughout. She dominated the stroke play on Olympia’s par-72 South course, which was set up at 6,403 yards. Opening with a 68, she posted a 4-under 140 for her 36 holes — four strokes better than closest challenger Casie Cathrea of Livermore, Calif.

Then it was on to match play for the 64 survivors. Marissa Chow, of Honolulu, was Jutanugarn’s first match play opponent and won the first hole. That was just a wakeup call. Making six birdies in a nine-hole stretch, Jutanugarn eliminated Chow 6 and 4.

En route to a battle with Dottie Ardina of the Philippines in the final Jutanugarn eliminated Sarah Schmelzel of Phoenix 4 and 3 in the second round, Gabriella Then of Rancho Cucamonga, Calif., 1-up in the quarterfinals and — in the most onesided match of the week — 14-year old Amy Lee of Brea, Calif., 8 and 6 in the semifinals. Ardina, 17, had a much tougher semifinal before ousting China’s Yu Liu 2-up.

The 36-hole battle for the title was a nailbiter throughout. Neither player was better than 1-up until Jutanugarn rolled in a two-foot birdie putt on the 31st hole to go 2-up. Though she lost the 33rd hole to go back to 1-up, the end wasn’t far off. On the 35th hole Ardina three-putted, missing a three-footer for par, and Jutanugarn closed out the match with a four-footer for par and a 2 and 1 victory.

“I’m disappointed because my putting dropped me down,” Ardina said. She hit 34 of 35 fairways and missed only three greens in the title match.

When the week started the logical favorite was Katelyn Dambaugh, runner-up to Doris Chen in 2010. A high school junior from Goose Creek, S.C., who has already picked her college — the University of South Carolina, Dambaugh wasn’t fazed by the weather — “it’s a little hotter at home than this — and was much more comfortable with match play than Jutanugarn. Plus, Dambaugh had the experience of the previous year’s run to the title match.

“It gave me a lot more confidence in myself. I had never been in a situation like that, and it was awesome,” Dambaugh said. She didn’t get beyond second round this time, losing 3 and 1 to Keel. Another former U.S. Junior Girls runner-up, Karen Chung (2008), made it to the quarterfinals before falling 6 and 5 to Liu.

Neither Jutanugarn nor Dambaugh expected the heat to be a factor early in the week. Jutanugarn felt it was hotter in her native Thailand. Jutanugarn couldn’t get distracted anyway. Her sister Moriya, who served as her caddie only because a wrist injury forced her withdrawal from the tournament, kept her focused.

The sisters didn’t always get along, either. After accepting the winner’s trophy Ariya thanked her parents Somboon and Narumon as well as her sister.

“She’s so nice. She tells me, if she played in this tournament, she was going to beat me,” Ariya said.

The Jutanugarns are no strangers to the U.S. They started spending summers in the U.S. in 2004 when the parents brought both girls came to a tournament in San Diego. This summer the girls were entered in 12 tournaments before returning to Thailand. The week before the Junior Girls both were in the U.S. Women’s Open at The Broadmoor in Colorado Springs. Ariya, who had won the American Junior Golf Association’s Rolex Girls Junior earlier in the summer, was one of five members of the Junior Girls’ field who competed at The Broadmoor.

The Junior Girls, the 58th USGA championship staged in the Chicago area, had been held in the area only once previously — in 1951 at Onwentsia. That year the event had only 32 entries. This year’s drew 1,084 that included players from 35 states and nine countries.