The 2015 WTA Tour was the elite professional tennis circuit organised by the Women's Tennis Association for the 2015 tennis season. The 2015 WTA Tour calendar comprises the Grand Slam tournaments
Serena Williams finished the year as world No. 1 for the fifth time in her career. She won five tournaments during the season, including three majors at the Australian Open, the French Open, and the Wimbledon Championships (completing a non-calendar year Grand Slam). She also won two Premier Mandatory and Premier 5 events.