Top-seeded Halep won 10 straight games in beating Sara Sorribes Tormo 6-4, 6-0 to reach the second round of the French Open on Sunday and extend her winning streak to 15 match
Svitolina, the fourth seed, received a first round bye and dropped just three games in a dominant 6-1, 6-2 victory over 35th-ranked Petra Martic.
Grigor Dimitrov beat David Goffin 7-5, 4-6, 6-3 to become the first debutant to win the season finale since 1998.
Roger Federer says he can't wait to get back on court in Australia after a shocking defeat at the hands of David Goffin.
David Goffin shocked overwhelming favourite Roger Federer on Saturday in the last four of the ATP Finals.
Grigor Dimitrov struggled to live up to the hype and often found himself written off as a serial underachiever.
Bulgaria's Grigor Dimitrov raced into the semi-finals of the ATP Finals with a 6-0, 6-2 demolition of David Goffin.
Nadal pulled out of the ATP Finals, admitting he had lost his fitness battle after crashing to defeat in three sets to Goffin.