Novak Djokovic and Serena Williams target quickfire second round wins at Wimbledon on Wednesday to escape the brutal heat expected to send temperatures soaring to a tournament record of 35 degrees.
Defending champion Djokovic takes on Finnish veteran Jarkko Niemenin in the Centre Court opener.
World number 92 Nieminen is playing in his 12th and last Wimbledon having ended the All England Club career of 2002 champion Lleyton Hewitt over five sets in the first round.
Djokovic, also the 2011 champion, has a 5-1 career record over the 33-year-old Nieminen, a quarter-finalist in 2006.
The last time Djokovic lost in the second round at a Grand Slam was at 2008 Wimbledon, when as number three seed he was defeated by Marat Safin.
Fourth seed and French Open champion Stan Wawrinka takes on world number 48 Victor Estrella Burgos, only the second Dominican Republic player to take part in a Grand Slam.
Wawrinka recorded his best Wimbledon performance by reaching the quarter-finals in 2014.
Japanese fifth seed Kei Nishikori takes a 6-1 career lead into his second round match against Santiago Giraldo while 2014 semi-finalist Milos Raonic, the seventh seeded Canadian faces German veteran Tommy Haas.