Briefly: Kevin Na makes two back-nine eagles, takes lead in Shriners Hospital for Children Open

Las Vegas resident Kevin Na posted two back-nine eagles and shot a 9-under 62 on Friday for a share of the second-round lead in the PGA Tour's Shriners Hospitals for Children Open.

Playing alongside Phil Mickelson at Vegas resort TPC Summerlin, Na eagled the par-5 13th and 16th holes and added birdies on the par-3 17th and par-4 18th to match Lucas Glover (63), 2017 winner Patrick Cantlay (64) and Brian Stuard (65) at 12-under 130.

Na made four long putts on the back nine Friday, holing out from 43 and 35 feet for the eagles and 23 and 22 feet on the closing birdies.

Mickelson was 8 under, following an opening 65 with a 69. He missed the cut last week at the Safeway Open in his season debut.

Top-ranked Brooks Koepka missed the cut in his season debut with rounds of 70 and 71. He's the first world No. 1 to play the Vegas stop since Greg Norman in 1988.

Cheyenne Knight shot a 4-under 67 and took a share of the lead into the weekend in her home LPGA Tour event, the Volunteers of America Classic in The Colony, Texas. She shared the lead at 9-under 133 with Alena Sharp (65) and Brittany Altomare (66).

The Los Angeles Sparks fired General Manager Penny Toler as the WNBA investigates a postgame tirade she made after the team lost in the second round of the WNBA playoffs.

Toler, who is black, acknowledged using the slurs but told ESPN they weren't directed at the players.

American Dalilah Muhammad set her second world record in 10 weeks in winning the 400-meter hurdles at the world track and field championships in Doha, Qatar.

Muhammad finished in 52.16 seconds and broke, by .04 seconds, the world record she set at the U.S. national championships in July.

"I was looking to see who won, and then I noticed, when they said, 'world record,' that I had broken it," Muhammad said.

Also Friday, Qatari high jumper Mutaz Essa Barshim won on home turf, clearing 7 feet, 9.31 inches for his second world title in a row.

Men's tennis: Andy Murray, who had won consecutive singles matches for the first time since undergoing hip surgery in January, lost in the China Open to top-seeded Dominic Thiem 6-2, 7-6 (3).

College basketball: Merl Code, a Clemson point guard in the 1990s who later worked with Nike and Adidas, was sentenced to three months in prison for his role in a college basketball bribery scheme that focused on NBA-bound athletes.

Women's boxing: A Saturday bout between Olympic champion Claressa Shields and Ivana Habazin of Croatia was called off after Habazin's trainer, James Ali Bashir, was injured in an altercation before the weigh-in. Bashir was hit, fell and struck his head on the floor. The bout was to be Shields' debut in her hometown of Flint, Mich.