What to watch in sports this long weekend

The Buzzer will be off Friday through Canada Day. Here are some things to follow in the meantime, along with a few news updates.

Canadian track and field trials

Last night in Montreal, reigning hammer throw world champions Ethan Katzberg and Camryn Rogers cemented their spots in the Paris Olympics by winning the national men's and women's titles, respectively.

Tonight's headliner is Olympic silver medallist Moh Ahmed in the men's 5,000 metres. The marquee races on Friday night are the men's and women's 100m finals, featuring Andre De Grasse and ascendant sprinter Audrey Leduc, while indoor world champion Sarah Mitton competes in the women's shot put.

Saturday night's lineup is led by reigning world champ Marco Arop in the men's 800m and rising star Christopher Morales Williams in the men's 400. The closing session on Sunday afternoon includes Leduc in the women's 200m final and several-times national champion Aaron Brown in the men's 200.

De Grasse is skipping the 200, partly because the reigning Olympic champion has already run the qualifying time for Paris. He's also achieved the Olympic standard in the 100, and the other stars mentioned above have met their criteria as well. So, if some unlucky accident should befall them in Montreal, they'd probably get a spot on the Olympic team anyway via the selection committee.

The pressure is much more intense at the U.S. track and field trials in Oregon, where for the most part you must finish in the top three to get an Olympic spot. Having already won the 100m events, American stars Noah Lyles and Sha'Carri Richardson look to secure their 200m entries on Saturday night.

In other track and field news, five-time Olympic gold medallist Elaine Thompson-Herah of Jamaica announced