"This photo provided by Sports Illustrated shows the cover of the 2015 ""Sports Person of the Year"" magazine issue, featuring tennis player Serena Williams. (Yu Tsai for Sports Illustrated via AP) USAGE IN NORTH AMERICA ONLY FOR TWO WEEKS, ENDING DEC. 31, 2015, TO PROMOTE THE SPORTS ILLUSTRATED SPORTSPERSON ISSUE ONLY. CREDIT: YU TSAI FOR SPORTS ILLUSTRATED; ANY USE AFTER DEC. 31, 2015 REQUIRES PERMISSION FROM SPORTS ILLUSTRATED. NO ARCHIVING; NO LICENSING; MANDATORY CREDIT Photo: Yu Tsai, Associated Press"