Serena Williams is Sports Illustrated's Sportsperson of the Year — the first female athlete honored on her own by the magazine in more than 30 years.
Williams came within two matches of tennis' first calendar-year Grand Slam since 1988, a bid that ended with a semifinal loss at the U.S. Open.
In all, the 34-year-old American went 53-3 during 2015 with five titles, including at the Australian Open, French Open and Wimbledon. Williams was No. 1 in the WTA rankings all season.
"She was the most deserving person for the award. She had an amazing year. The way she won her events; the fact that she's done this for so many years at such a high level," said Paul Fichtenbaum, editor of the Sports Illustrated Group. "She was a terrific candidate in a year of terrific candidates."
Monday's announcement marks a switch to the formal name of the SI award; past recipients were touted as Sportsman or Sportswoman of the Year.
"We just felt this was a natural evolution. ... We're not making a huge deal out of it," Fichtenbaum said. "It just feels like the right time to make the change."
Runner Mary Decker in 1983 was the last female athlete to earn the magazine's award by herself.
The U.S. women's national soccer team was picked by SI in 1999; speedskater Bonnie Blair in 1994 and gymnast Mary Lou Retton in 1984 were co-honorees with male Olympians.
"Men's sports has dominated until recently, when women's sports has grown in popularity, and the competition is better than ever," Fichtenbaum said. "There's more of a focus on women's sports now. It's grown considerably. Specifically why? I'm not sure."