A three-time champion in Montpellier, Richard Gasquet defeated Gilles Simon in the Open Sud de France, but Grigor Dimitrov dropped out.
Rafael Nadal's presence in a Cape Town exhibition is "truly special" for Roger Federer.
Over three months on from her last match, Bianca Andreescu is hoping to return to the court in the Fed Cup this week.
Juan Ignacio Londero's title defence opened with a 6-2 7-5 victory over Marco Cecchinato.
There were no major shocks in the Open Sud de France on Tuesday, as Felix Auger-Aliassime eventually came through against Damir Dzumhur.
Rick Macci says Sofia Kenin told him before she flew out to the Australian Open that she is heading to the top of the rankings.
As her wait for a 24th grand slam singles title goes on, Serena Williams has been urged to alter her strategy by coach Patrick Mouratoglou.
Denis Shapovalov and Grigor Dimitrov learned their round-of-16 opponents as the Open Sud de France got under way in Montpellier.
Rick Macci says he knew Sofia Kenin could take the tennis world by storm as early as when her racket was almost as big as her.