Novak Djokovic says he "suffered a lot" during a hard-fought victory over fellow veteran Marin Cilic in the second round of the Shanghai Masters.
The 38-year-old Serb, playing in his first first tournament since the US Open and his first non-Grand Slam match since May, clinched a 7-6 (7-2) 6-4 win in one hour and 54 minutes over his 37-year-old opponent.
The combined age of Djokovic and Cilic - 75 years and 139 days - was the oldest ever between two opponents in an ATP Masters 1000 main draw match.
Little could separate the pair in the first set as both players held their serve before Djokovic took the tie-break.