Paris • John Isner stayed on track for the last spot at the ATP Finals by beating Juan Martin del Potro 6-4, 6-7 (5), 6-4 in the Paris Masters quarterfinals on Friday.
Isner, who played with strapping above his left knee, broke for 2-1 in the third set. With an unreturnable serve on his first match point, Isner topped del Potro for only the third time in nine matches.
Krajinovic, a qualifier ranked 77, is through to his first Masters semifinal, and the first qualifier to reach the semis since Jerzy Janowicz in 2012.
He sealed victory on his first match point on Cilic's serve with a cross-court forehand winner and became emotional, dropping his racket, blowing kisses, and tearing up.