Akani Simbine and Henricho Bruintjies led South Africa to a surprising 1-2 finish in the men's 100 meters at the Commonwealth Games that may have Yohan Blake thinking twice about going home to Jamaica.

Usain Bolt joked that Blake may not be welcome home if he didn't win the title on the Gold Coast.

The 2011 world champion entered Monday's final as the hot favorite after posting the quickest time of the season and in the first two rounds, but stumbled early and never regained his form against the two runners to his right.

Simbine, who was fifth at the 2016 Olympics and at last year's world titles, won in 10.03 second, with Bruintjies second in 10.17, shading Blake by 0.02.

Michelle-Lee Ahye won her first gold medal at a major international meet, celebrating with an air punch as she crossed the finish line in 11.14 seconds and relegated Jamaicans Christania Williams (11.21) and Gayon Evans (11.22) to silver and bronze. England's Asha Philip was fourth in a repeat of her finish in Glasgow four years ago.

The win for Ahye, a finalist at the 2016 Olympics and the last two world championships, delivered Trinidad and Tobago its first Commonwealth title in the women's 100 and meant a Jamaican hasn't won the title since 2006. It came in the absence of the top Jamaican, Elaine Thompson, who won the Olympic 100-200 double in 2016 but is only running the 200 on the Gold Coast.

World champion Tom Walsh won the shot put gold for New Zealand at 21.41 meters after a setting a games record 22.45 in qualifying.

Nigeria's Chukwuebuka Enekwechi took silver at 21.14, narrowly ahead of 2014 champion O'Dayne Richards of Jamaica.

Ugandans collected gold and bronze in the women's 10,000 meters, with Stella Chesang letting the Kenyans set the pace for most of the 25-lap race before surging late to win in 31 minutes, 45.30 seconds.

Stacy Ndiwa held off a late charge by Mercyline Chelangat to secure silver for Kenya.

Olympic and world 800-meter champion Caster Semenya started her quest for a Commonwealth Games double with a commanding win in the heats of the 1,500.

The South Africa flag bearer dictated the race from the front, setting the pace the whole way and finishing in 4 minutes, 5.86 seconds to lead all qualifiers into the final. Beatrice Chepkoech won the second heat but her fellow Kenyan Winny Chebet, the only starter with a sub-4 minute career PB, tangled with Australian runner Linden Hall and fell to the track halfway through the last stretch.

Isaac Makwala of Botswana coasted across the line to win the opening heat of the 400 semifinals in 45.00 and then did three press ups as his rivals slumped behind him, heaving in deep breaths.

Makwala, who reached the 200 final at last year's world championships days after being refused entry to the stadium for the 400 final because of quarantine restrictions amid a viral outbreak, is targeting his first medal at a major meet. Javon Francis of Jamaica was next fastest at 45.38 and India's Muhammed Anas Yahiya reached the final by winning his heat in 45.44.

After the first five events in the decathlon, defending champion Damian Warner has a 129-point lead over Canada teammate Pierce Lepage.

The Olympic bronze medalist opened with his season-best 10.29 in the 100, threw a personal best 15:11 meters in the shot put, recorded 7.54 in the long jump and a season-best 2.04 in the high jump. He capped off day one by winning his 400 in 48.12 for a total of 4,509 points.

Warner said he was content with his performance across the first day and didn't rule out a shot at the games record.

"I'll come out tomorrow and start with the hurdles and if it's there when it comes down to the 1,500 — I'll go for it," he said.