Rafael Nadal set up a tantalising second-round contest with old foe Novak Djokovic at Paris 2024 after coming through his opening Olympics singles match.
Spain's Nadal, 38, had cast doubt on whether he would even be able to play against Hungary's Marton Fucsovics because of a thigh injury.
But the 2008 gold medallist had enough to see off Fucsovics in a 6-1 4-6 6-4 win.
Nadal, playing at the scene of his record 14 men's singles titles, will face Djokovic in the coming days as the pair extend their enduring rivalry to a 60th meeting.