WIMBLEDON, England -- Defending champion Novak Djokovic won under the lights Wednesday at Wimbledon, beating American Ryan Harrison 6-4, 6-4, 6-4 in the final match of the day.
With the schedule delayed because of afternoon rain, Djokovic and Harrison played under the retractable roof on Centre Court and finished their second-round match at 9:52 p.m.
The top-seeded Djokovic lost only four points on his second serve and saved all six break points he faced. He has won three of the past four Grand Slam titles but was beaten this month in the French Open final by Rafael Nadal.
Novak Djokovic
Serbia's Novak Djokovic plays a forehand shot during his second round men's singles match against US player Ryan Harrison on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Novak Djokovic
Serbia's Novak Djokovic plays a forehand shot during his second round men's singles match against US player Ryan Harrison on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Ryan Harrison
Ryan Harrison of USA returns the ball during his Gentlemen's Singles second round match against Novak Djokovic of Serbia on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Novak Djokovic
Novak Djokovic of Serbia serves the ball during his Gentlemen's Singles second round match against Ryan Harrison of USA on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Ryan Harrison
Ryan Harrison of USA hits a forehand return during his Gentlemen's Singles second round match against Novak Djokovic of Serbia on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Novak Djokovic
Serbia's Novak Djokovic plays a shot during his second round men's singles match against US player Ryan Harrison on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Ryan Harrison
US player Ryan Harrison stretches to play a forehand shot during his second round men's singles match against Serbia's Novak Djokovic on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Novak Djokovic
Novak Djokovic of Serbia hits a forehand return during his Gentlemen's Singles second round match against Ryan Harrison of USA on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Novak Djokovic
Novak Djokovic of Serbia hits a backhand return during his Gentlemen's Singles second round match against Ryan Harrison of USA on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Novak Djokovic
Novak Djokovic of Serbia hits a forehand return during his Gentlemen's Singles second round match against Ryan Harrison of USA on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Wimbledon
The crowd perform a mexican wave during the Gentlemen's Singles second round match between Novak Djokovic of Serbia and Ryan Harrison of USA on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Ryan Harrison
Ryan Harrison of USA celebrates a point during his Gentlemen's Singles second round match against Novak Djokovic of Serbia on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Novak Djokovic
Novak Djokovic of Serbia takes a break during his Gentlemen's Singles second round match against Ryan Harrison of USA on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Ryan Harrison
US player Ryan Harrison stretches to play a forehand shot during his second round men's singles match against Serbia's Novak Djokovic on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Ryan Harrison
Ryan Harrison of USA shows his frustration during his Gentlemen's Singles second round match against Novak Djokovic of Serbia on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
Novak Djokovic
Serbia's Novak Djokovic stretches to play a shot during his second round men's singles match against US player Ryan Harrison on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Novak Djokovic
Serbia's Novak Djokovic plays a shot during his second round men's singles match against US player Ryan Harrison on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Ryan Harrison
US player Ryan Harrison plays a backhand shot during his second round men's singles match against Serbia's Novak Djokovic on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Novak Djokovic
Serbia's Novak Djokovic serves during his second round men's singles victory over US player Ryan Harrison on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Ryan Harrison
US player Ryan Harrison stretches to play a shot during his second round men's singles defeat to Serbia's Novak Djokovic on day three of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on June 27, 2012.
Novak Djokovic
Novak Djokovic of Serbia is congratulated by Ryan Harrison of USA after their Gentlemen's Singles second round match on day three of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2012 in London, England.
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AP | Posted: 06/27/2012 8:59 pm Updated: 06/27/2012 8:59 pm