What's the deal with the most tie breaks won. According to ATP Sampras won 274 tie breakers ?
anyway, even if Sampras won 328 after AO Fed overtook him
ATP counting is unreliable before 1992. Anyone active before then, as Sampras was, will have faulty stats.
Their official stat count only TBs with scorelines. You can see the difference if you search old results:
The TB from DC against Forget is not counted, because it just say 6-7. The TBs in the Tour Championship are counted, because we see 7-6(3) or 7-6(5).
There is no doubt Sampras won 328 TBs and had the record. Federer has now won 333.