Canucks winger David Booth had surgery and will miss the rest of the regular season after suffering a leg injury last Saturday against Detroit. Vancouver general manager Mike Gillis told a Vancouver radio station ‘‘there’s a chance’’ Booth could return for the playoffs. The team has not provided details on the exact nature of Booth’s injury . . . According to NHL.com, Panthers general manager Dale Tallon told the Miami Herald Thursday that 40-year-old forward Alex Kovalev signed his retirement papers and is no longer with the organization. Kovalev hadn’t played since a loss at Pittsburgh Feb. 22 . In 1,316 career games, he tallied 430 goals and 599 assists. He also appeared in 123 playoff games, scoring 45 goals with 55 assists, and was the final active member of the 1994 Rangers Stanley Cup championship team. . . . . . Canucks defenseman Alex Edler was suspended two games for charging Coyotes goaltender Mike Smith Thursday . . . The Devils acquired forward Matt D’Agostini and a conditional seventh-round selection in 2015 from the Blues for a conditional 2015 fifth-round pick.TENNIS Sharapova, Djokovic on to third roundNo. 2-ranked Maria Sharapova was slowed only by a half-hour power outage during the night session, beating Eugenie Bouchard, 6-2, 6-0, in the second round of the Sony Open at Key Biscayne, Fla. With an ankle injury forcing No. 3-ranked Victoria Azarenka to withdraw, Lauren Davis was given her spot and proceeded to beat Madison Keys, 6-1, 5-7, 7-6 (9-7). On the men’s side, No. 1-ranked Novak Djokovic beat Lukas Rosol, 6-1, 6-0. Fifth-seeded Juan Martin del Potro, who ended Djokovic’s 22-match winning streak last week in the Indian Wells semifinals, was upset by Tobias Kamke, 6-7 (5-7), 1-6. Fighting MMA promoters stunned at hoaxMixed martial arts promoters Christo Piliafas and Scott DiPonio learned Charles Rowan, one of their fighters, was a suspect in the holdup of a Michigan gun shop this week. Two weeks ago they raised more than $1,000 to help the amateur heavyweight’s family pay for his alleged funeral. The 25-year-old supposedly died in a car wreck in February, his girlfriend, Rosalinda Martinez, claimed. The couple and a friend, Michael Bowman, are charged with armed robbery and assault with intent to murder . . . Olympic boxers will fight without head guards in a 10-point, pro-style scoring system starting this year after several rule changes were made by the International Boxing Association this week. The AIBA says medical data suggests fighting without head guards will decrease concussions. MISCELLANY Samuelson, Meyer will run Marathon Inaugural Olympic gold medalist Joan Samuelson will run this year’s Boston Marathon on the 30th anniversary of her 1983 victory. Samuelson, 55, won the 1979 and 1983 Boston Marathons before winning the Olympic marathon in Los Angeles in 1984. Greg Meyer, 55, the most recent American male to win in Boston, will also run on the 30th anniversary of his 1983 victory . . . Laurenne Ross, of Mammoth Mountain, Calif., won the super G at the US Alpine Championships in Squaw Valley, Calif., beating Stacey Cook by 0.01 seconds for her first national title. Defending champion, and hometown favorite, Julia Mancuso finished third. In the men’s race, Travis Ganong won by 0.20 seconds over Jared Goldberg. Mark Engel finished third . . . Hannah Kearney, of Norwich, Vt., won her fourth World Cup moguls title by 91 points over Canada’s Justine Dufour-Lapoints in the FIS Freestyle World Cup Finals in Sierra Nevada, Spain, and the US took the Nations Cup for the second year in a row. In the men’s dual moguls race, Canada’s Alex Bilodeau won, with Pat Deneen of Cle Elum, Wash., placing second . . . Efforts to keep the Sacramento Kings from moving to Seattle received a boost from software tycoon Vivek Ranadive, who will lead the bid to keep the team in town, joining health-club financier Mark Mastrov and billionaire Ron Burkle . . . The University of Louisville placed defensive line coach Clint Hurtt on leave while he prepares to answer allegations of violations the NCAA says he committed while he was an assistant at Miami.