Ram came back after dropping the opening set and defeated Rik De Voest, a wild-card entrant from South Africa, 6-7 (3-7), 6-3, 6-3.
Robert did the same in beating American Brendan Evans 3-6, 6-2, 6-2.
In two other matches, also comebacks, Laurent Recouderc of France eliminated Belgian Steve Darcis 3-6, 6-3, 6-4 and Blaz Kavcic of Slovenia topped Frenchman Thierry Ascione 1-6, 7-5, 6-3.
The top seed in the event is Gael Monfils of France.
Frenchman Joe-Wilfried Tsonga, the defending champion, is not entered in the tournament this year.
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