World number one Serena Williams comfortably booked her place in round two ©Getty Images

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Serena Williams proved too strong for Russia's Olympic doubles champion Ekaterina Makarova ©Getty Images
Serena Williams proved too strong for Russia's Olympic doubles champion Ekaterina Makarova ©Getty Images
A number of famous faces watched Serena Williams' match, including American actor Kevin Spacey ©Getty Images
A number of famous faces watched Serena Williams' match, including American actor Kevin Spacey ©Getty Images
Sister Venus also reached round two as she battled past Kateryna Kozlova of the Ukraine ©Getty Images
Sister Venus also reached round two as she battled past Kateryna Kozlova of the Ukraine ©Getty Images
Agnieszka Radwanska of Poland was another top seed to make it through to the second round ©Getty Images
Agnieszka Radwanska of Poland was another top seed to make it through to the second round ©Getty Images
Olympic champion Andy Murray beat Lukas Rosol of the Czech Republic in straight sets ©Getty Images
Olympic champion Andy Murray beat Lukas Rosol of the Czech Republic in straight sets ©Getty Images
Bernard Tomic of Australia was again involved in controversy as he swore at a member of the crowd ©Getty Images
Bernard Tomic of Australia was again involved in controversy as he swore at a member of the crowd ©Getty Images
The Australian eventually fell to a four set defeat to Damir Dzumhur of Bosnia ©Getty Images
The Australian eventually fell to a four set defeat to Damir Dzumhur of Bosnia ©Getty Images
Ivo Karlovic served a US Open record of 61 aces in his first round encounter ©Getty Images
Ivo Karlovic served a US Open record of 61 aces in his first round encounter ©Getty Images
Janko Tipsarevic of Serbia beat Novak Djokovic's Wimbledon conqueror Sam Querrey to book his place in the next round ©Getty Images
Janko Tipsarevic of Serbia beat Novak Djokovic's Wimbledon conqueror Sam Querrey to book his place in the next round ©Getty Images