After Novak Djokovic and Roger Federer secured comfortable passages into the second round, fellow heavyweights Rafael Nadal and Andy Murray take centre stage on the second day at Wimbledon.

Defending women's champion Petra Kvitova begins her quest for consecutive titles, while Caroline Wozniacki, Serena Williams and Laura Robson also get their tournaments underway on Tuesday.

Here are the key matches:

Centre Court (1pm start)

Akgul Amanmuradova vs.Petra Kvitova - 1st round
Thomaz Bellucci vs. Rafael Nadal - 1st round
Nikolay Davydenko vs. Andy Murray - 1st round

Court Number One (1pm start)

Jo-Wilfried Tsonga vs. Lleyton Hewitt - 1st round
Irina Falconi vs. Victoria Azarenka - 1st round
Jamie Baker vs. Andy Roddick - 1st round

Court Number Two (11.30am start)

Serena Williams vs. Barbora Zahlavova Strycova - 1st round
Robin Haase vs. Juan Martin Del Potro - 1st round
Caroline Wozniacki vs. Tamira Paszek 1st round

Court Number Three (11.30am)

Laura Robson vs. Francesca Schiavone - 1st round
Laura Pous-Tio vs. Anne Keothavong - 1st round
David Ferrer vs. Dustin Brown - 1st round

Court Number 12 (11.30am start)

Ruben Ramirez Hidalgo vs. Mardy Fish - 1st round
Casey Dellacqua vs. Marion Bartoli - 1st round
Jurgen Melzer vs. Stanislas Wawrinka - 1st round
Svetlana Kuznetsova vs. Yanina Wickmayer - 1st round

Court Number 14 (11.30am start)

Kei Nishikori vs. Mikhail Kukushkin - 1st round
James Ward vs. Pablo Andujar - 1st round

Court Number 18 (11.30am start)

Feliciano Lopez vs. Jarko Nieminen - 1st round
Elena Baltacha vs. Karin Knapp - 1st round