MEMPHIS: Sam Querrey rallied for a 6-7 (3/7), 7-6 (7/5), 6-3 triumph over fellow American John Isner Sunday in the final of the ATP Tour's Memphis tournament.

Isner, the sixth seed, overpowered his doubles partner and newly named Davis Cup teammate in the first set, but faltered after taking a 5-2 lead in the second-set tiebreaker.

Eighth-seeded Querrey, who upset top-seeded Andy Roddick in the quarter-finals, battled back to claim the third title of his career and first of 2010.

Querrey, who was never broken in the match, won two straight points on Isner's serve to take a 6-5 lead in the second-set tiebreaker and rolled from there.

He broke Isner for a 2-1 lead in the third, and broke again to seal the match.

Isner had been in firm control, taking a 5-2 lead in the second-set tiebreaker when Querrey mis-hit a return.

But the mistake seemed to focus Querrey, who won five straight points, starting with an ace.

In the third set Isner's formidable first serve began to flag, while Querrey's serve got stronger and stronger.

The two were to play on the same side of the net later Sunday when they took on Ross Hutchins and Jordan Kerr in the men's doubles final later Sunday.