Neither Andy Roddick nor John Isner could slay a giant Friday at the U.S. Open .Thus, today’s semifinals feature the undisputed four giants of the men’s game:This year’s French Open winner Rafael Nadal (who dismantled a hobbled Roddick in straight sets Friday) vs. three-time Slam finalist Andy Murray (who took out Isner in four) — No. 2 in the world vs. No. 4.Plus, five-time champion Roger Federer vs. reigning Australian Open and Wimbledon winner Novak Djokovic (No. 3 vs. No. 1) — a rivalry simmering since the French Open, when Federer snapped Djokovic’s 43-match winning streak.

Nadal beats pal Nalbandian to make US Open last 16

          Rafael Nadal was back on his feet after a scary moment during his news conference about two hours after his third-round victory at the U.S. Open on Sunday, when he was overcome by pain from cramping in his right hamstring and thigh.Reporters were cleared out of the interview room while the defending champion was given bags of ice to put on his leg and water to drink. Earlier, Nadal overcame a blister on his right foot and two tight sets to beat 2002 Wimbledon runner-up David Nalbandian 7-6 (5), 6-1, 7-5 and reach the fourth round on a muggy afternoon with temperatures in the 80s.