Briefly: DeMarco Murray retires from NFL

Four months after being released by the Tennessee Titans, running back DeMarco Murray announced his retirement from the NFL.

Murray, the 2014 Offensive Player of the Year, lost his job to Derrick Henry last season and was due to make $6.25 million in 2018.

"I think you just wake up," said Murray, 30. "I've always heard the saying when you know, you know, and one day that day will come, and for me it was the last year or two."

Murray ran for 659 yards and six touchdowns last season but missed the Titans' final regular-season game and two playoff games because of a knee injury.

Murray was playing for Dallas in 2014 when he won the NFL rushing title, gaining 1,845 yards.

Michael Kim took a four-shot lead at the PGA Tour's John Deere Classic in Silvis, Ill.

Kim, winless in 84 PGA Tour starts, was 16 under through 35 holes when darkness ended the second round. Storms had suspended play twice during the day.

• Scott Parel grabbed a one-stroke lead in the Constellation Senior Players Championship in Highland Park, Ill., shooting a 6-under 66 to reach 11 under through two rounds.

The federal judge overseeing the NHL concussion case denied class-action status for former players suing the league over head injuries.

U.S. District Judge Susan Richard Nelson, in St. Paul, issued the first significant victory for the league in a landmark lawsuit filed almost five years ago. Nelson wrote that "widespread differences" in state laws about medical monitoring, which the retired players are seeking, would "present significant case management difficulties."

Had the judge certified the former players, more than 5,000 would have been allowed to join the case.

• Vegas agreed to terms with goalie Marc-Andre Fleury on a three-year contract extension worth an average of $7 million a year.

College basketball: Duke athletic director Kevin White will serve as chairman of the NCAA tournament selection committee in 2020, replacing Stanford athletic director Bernard Muir.