Lleyton Hewitt has the chance to become the oldest winner of the Queens Club tournament Lleyton Hewitt pulls off a swift forehand return against Juan Martin Del Potro. Picture: Carl Court. Lleyton Hewitt rolls back the years to beat Juan Martin del Potro in the quarter-finals at Queen's Club. LLEYTON Hewitt stands on the brink of Queen's Club history after storming into the Aegon Championships semi-final by brilliantly upstaging world No. 8 Juan Martin del Potro. Hewitt is now only four winning sets away from becoming first man to win five titles at Queen's Club, site of Wimbledon's premier lead-up event. If Hewitt overcomes Croat Marin Cilic tonight, he will tackle either Andy Murray or Jo-Wilfried Tsonga with the chance of becoming the oldest winner of the tournament. Reprising vintage grasscourt form, the former world No 1 downed del Potro 6-2 2-6 6-2 to earn a semi-final tilt at defending champion Cilic. "Throughout today I played great," he said. My ball striking was fantastic. Even though I was 4-0 down in the second set, I didn't really do too much wrong. He played incredible tennis. Cilic is going to be another tough one, very similar to my match against (Sam) Querrey yesterday and against del Potro today. In terms of that, I have had good preparation for playing him, but he's the defending champ here. He's obviously beaten (Feliciano) Lopez in a tight one yesterday, and to beat (Tomas) Berdych in straight sets, he's going to have quite a bit of confidence. Posting his first win over a fellow major winner since victory against Roger Federer in the 2010 Halle final, Hewitt again showed why he will be dangerous at Wimbledon in 10 days. "It's been a long wait for me," Hewitt said. Pretty much once I was out of the Australian Open (in January), I was focused on this tournament and Wimbledon. Obviously there is times of the year I look forward to, especially at my age now, the stage of my career that I'm at. These four weeks are one of them. If the South Australian overcomes fifth seed Cilic tonight, he will remain in the hunt to become the oldest player to win the Queen's Club title. American Jimmy Connors was 30 years and 224 days old when he prevailed here in 1983. Hewitt is 32. Former world champion Hewitt will contest an ATP World Tour semi-final for the first time since Newport last year. Elated with the success, Hewitt sat on his courtside chair with four-year-old son Cruz after reaching the last four here for the first time since 2006. Winless since March, Hewitt has been a revelation over the past week with wins over Michael Russell, 10th seed Grigor Dimitrov, sixth seed Querrey and now fellow US Open finalist del Potro. Hewitt dominated initially with familiar guile and aggression to break del Potro's serve in the sixth and eighth game, excelling in cat and mouse baseline rallies to claim the first set. But the tide turned abruptly when play resumed as del Potro blasted his way back into contention, forging breaks in the first and third games of the second set.. With the contest in the balance, Hewitt reclaimed the initiative when del Potro stumbled into error in the fourth game of the deciding set. Hewitt sealed the match - by breaking serve for a fourth time - with a precision backhand volley winner. Hewitt previously won the Queen's Club title in 2000, '01, '02 and '06. Cilic advanced to the semis with a composed 7-5 7-6 (7-4) win over 2010 Wimbledon finalist Berdych. Murray overcame German Benjamin Becker 6-4 7-6 (7-3) before Tsonga overwhelmed American Denis Kudla 6-3 6-2.