Novak Djokovic held a commanding 6-1, 4-1 lead when Nishikori called it quits. 

By Associated Press
January 23, 2019

MELBOURNE — Novak Djokovic advanced to the Australian Open semifinals when Kei Nishikori retired in the second set after less than an hour of play.

Djokovic was leading 6-1, 4-1 when the eighth-seeded Nishikori let the umpire know he couldn't continue. Nishikori, the 2014 U.S. Open runner-up, played three matches that went to five sets in his first four rounds. Two of those went to the new fifth-set super tiebreaker introduced at the Australian Open this year.

Nishikori needed a medical timeout for treatment on his upper leg after the first set. He wasn't comfortable throughout the match, and had his service broken four times.

Djokovic is aiming for a men's record seventh Australian title. He will next play Lucas Pouille, who beat Milos Raonic earlier Wednesday.

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HOLE YARDS PAR R1 R2 R3 R4
OUT
HOLE YARDS PAR R1 R2 R3 R4
IN
Eagle (-2)
Birdie (-1)
Bogey (+1)
Double Bogey (+2)