DUBLIN, Ohio — No matter how it played out, Saturday night was the most important sleep of J.T. Poston’s life.He’d either survive 31 holes of golf with a four-shot lead on a near-evil test at Muirfield Village to earn the biggest win of his career, or he’d go back to bed Sunday knowing he blew it. He’d try and fail to sleep, knowing Monday morning he’d wake up to play another 36 holes down the road for a U.S. Open qualifier. Things would never be the same for Poston, no matter what.Turns out, it took 33 holes.Poston finished the marathon by outlasting Ryan Gerard in a two-hole playoff to win the Memorial Tournament, the 33-year-old journeyman earning his biggest victory on perhaps the toughest test of the PGA Tour season.As his caddie, Aaron Flener, celebrated with friends and family, fellow caddie Scott Vail shouted: “An extra two holes is better than an extra 36 big dog!”Flener concurred, the jovial, large gentleman falling to the ground with his arms outstretched as CBS analyst Colt Knost poured a beer over his mouth.Poston and Flener were deflated, in part because of the challenge they just survived.J.T. Poston hugs caddie Aaron Flener after Poston’s winning putt on the 18th green at the Memorial Tournament at Muirfield Village Golf Club. (Mike Mulholland / Getty Images)At Jack Nicklaus’ place among superstars like Scottie Scheffler, who said he thought he was going to shoot 90 on Friday, and Justin Thomas, who called the second round the “hardest round of golf that I can remember,” Poston’s Friday 65 lapped the field and thrust him atop the leaderboard. Then, when many expected him to return to the mean, he survived a Saturday rain stoppage and an early Sunday start to shoot 69 and extend his lead. After a two-hour break, the leaders were back out for the final.