London - Juan Martin del Potro set up a Wimbledon quarter-final clash against Rafael Nadal when he downed Gilles Simon of France 7-6 (7/1), 7-6 (7/5), 5-7, 7-6 (7/5) on Tuesday.
In a match suspended from Monday night due to darkness with the Argentine star two sets to one ahead, Del Potro sealed victory on a fifth match point after almost four and a half hours of action on Court Two.
On Wednesday, the 29-year-old will be playing in his first Wimbledon quarter-final since 2013, when he went on to lose to Novak Djokovic in an epic semi-final.
Del Potro trails world number one Nadal 10-5 in career meetings.
Wimbledon men's singles quarter-finals line-up (x denotes seeded player):
Roger Federer (SUI x1) v Kevin Anderson (RSA x8)
John Isner (USA x9) v Milos Raonic (CAN x13)
Novak Djokovic (SRB x12) v Kei Nishikori (JPN x24)
Juan Martín Del Potro (ARG x5) v Rafael Nadal (ESP x2)