Our guide to what to look out for on Day 3 of the London 2012 Olympic tennis event.
Roger Federer (SUI)  v Julien Benneteau: Before notching up magic No.7 on Wimbledon’s grass a few weeks back, Roger Federer had to survive what ended up being his biggest test of the tournament, fighting back from two sets down against Frenchman Julien Benneteau. The Swiss legend won’t have the luxury of letting the first two sets slip by today so expect him to race out of the blocks as the prospect of being taken to three sets in both his first and second round matches would not sit well.
Pick: Federer won’t let second-set match points slip by so easily after his opening round scare.
Serena Williams (USA)  v Urszula Radwanska (POL): After big sister and world No.2 Agnieszka Radwanska bombed out yesterday, Urszula will be determined to pick up the baton for the Poles. Unfortunately for her, it’s likely to be fleeting given she’ll square off against the current Wimbledon Champion, a woman on an Olympic mission. Both Williams Jr. and Radwanska Jr. are due to partner their older sisters in doubles matches later in the day. Serena will be determined to keep her slate clean after the day’s play.
Pick: Wililams Jr will make short work of Radwanska Jr.
Kim Clijsters (BEL) v Carla Suarez Navarro (ESP): Many tipped the Belgian mum to be doing battle with Australia’s US Open Champion Sam Stosur in Round 2. Instead, it’s the diminutive Spaniard with the Justine Henin-esque silky smooth backhand waiting across the net. Suarez Navarro edged Stosur in a marathon and will find it difficult to raise her level again playing a proven big-match performer.
Pick: Clijsters in two.
Caroline Wozniacki (DEN)  v Yanina Wickmayer (BEL): No longer the Slam-less No.1, given she’s surrendered the top spot, Denmark’s girl is struggling to rediscover her winning ways. The feisty, athletic Belgian has the game to pull the upset and will rate her chances of joining countrywoman Clijsters in the third round.
Pick: Wickmayer to blast through a three-set thriller.
Others to watch:
Juan Martin del Potro (ARG)  v Andreas Seppi (ITA): Delpo was solid in his opener and will pull the trigger to send off Italy’s Seppi.
Ana Ivanovic (SRB)  v Elena Baltacha (GBR): If the glamorous Serb is on her game it could be a tough day for the determined Brit. Expect Baltacha to thrive on the crowd though.
John Isner (USA)  v Malek Jaziri (TUN): Fair to say the giant American won’t have faced too many Tunisians in his career.
Juan Monaco (ARG)  v David Goffin (BEL): Argentina’s latest top-tenner may see his Olympic singles run falter against the gifted Belgian on the rise.
First round matches held over: We looked at these match-ups yesterday and while the rain may have given them the short shift, expect the results to remain the same: Victoria Azarenka (BLR) to crush Irina-Camelia Begu (ROM), Sara Errani (ITA) to end Venus Williams’s (USA) singles run and Federer and Wawrinka in a race against rain and approaching nightfall to begin their doubles campaign.