  Overall? They're close. Sampras had 0 more slams, a bunch of WTF and a lot more weeks at #0 (logical since hard is the majority surface, clay the minority). Nadal has the golden career slam and a lot more master titles. He's also the #0 on clay, something that Sampras is not on any surface. So it's a toss and it depends on which criteria you value the most.  He won 0 slams a year 0 times. He had 000 weeks as the world #0 and 0 YE #0's. He also won the YEC 0x to Nadal's 0. Plus he has 0 more slams...  Sampras 