Roger Federer, who turns 33 in August, is the all-time leader with 17 Grand Slam singles titles. He's three ahead of the retired Pete Sampras, but there is a serious threat looming in the distance.
Rafael Nadal, nearly five years his junior, already has 13 majors under his belt. Eight have come at the French Open, which begins play Sunday. Here's how the experts see the race between two of the greatest players ever:
Steve Flink has covered tennis for 40 years and is a columnist ...
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