Nishikori needed six match points to seal the win in two hours at the ATP Masters event held behind closed doors at the Foro Italico.
The Curitiba-based side top the Group C standings with six points from three matches, ahead of Chile's Colo-Colo on goal difference. Jorge Wilstermann are third with three points.
"We were the better side, that's for sure. We had lots of chances to score several goals in the first half, but it was still tight because Nice also had chances after our first two goals. But Keylor was exceptional," said PSG coach Thomas Tuchel.
Ismael Al Hammadi (L) of Shabab Al Ahli vies for the ball with Ali Nemati of Shahr Khodrou during the AFC Asian Champions League group B football match between Shabab Al Ahli of United Arab Emirates and Shahr Khodrou of Iran at Al Janoub Stadium in Doha, Capital of Qatar, Sept. 17, 2020. (Photo by Nikku/Xinhua)
Dominic Dale, the world number 70, also reached Stage Two after topping his group with two wins and one draw.
Yuliya Levchenko of Ukraine competes in the Women's High Jump at IAAF World Challenge Zagreb-70th Hanzekovic Memorial in Zagreb, Croatia, Sept. 15, 2020. (Igor Kralj/Pixsell via Xinhua)
The Spanish team will now entertain the winner of the game between Locomotive Tbilisi and Dinamo Moskva next week in the penultimate qualifying round. Enditem
JERUSALEM, Sept. 16 (Xinhua) -- Israeli champions Maccabi Tel Aviv reached the playoff round of the UEFA Champions League on Wednesday after beating Belarusian champions FC Dynamo Brest 1-0 at home.
PSG will travel to the southern coastal city of Nice for their next match on Sunday. Enditem
League leaders Saint-Etienne wasted a two-goal lead and missed out on a fourth straight win after drawing 2-2 at Nantes.
"We played too passive and were not aggressive enough in the tackles," Mainz sporting director Rouven Schroder said. Enditem