What to watch in Olympic sports this weekend

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March is a weird month. Is it spring? Is it winter? Is it nice? Is it nasty? Depends on the day. Pro sports are a mixed bag this time of year too. While the boys of summer go through spring training, the end of winter brings the dog days of the hockey and basketball seasons.  Olympic sports are also a strange brew right now. As skiing and snowboarding seasons wrap up this weekend, there are world championships happening in both curling and track and field, somehow. Here's a quick guide to what's going on:Track and field: World indoor championships This quirky meet tends to fly under the radar, but this year's edition in Belgrade is a prelude to an interesting outdoor season that will feature the world championships in Oregon in July. It's also a warmup for the Diamond League season, which starts in mid-May in Doha. Canada's headliner at the three-day world indoors is Damian Warner. The Olympic decathlon champion led the seven-event heptathlon after winning today's 60m dash and long jump legs and placing fourth in the shot put. The high jump was still in progress at our publish time. Warner will try to nail down his first world indoor title when the heptathlon concludes Saturday with the 60m hurdles, pole vault and 1,000m. None of the other three Canadians who won an individual track and field medal at last summer's Olympics — sprinter Andre De Grasse, distance runner Moh Ahmed and race walker Evan Dunfee — are competing in Belgrade. Gabriela DeBues-Stafford, who finished fifth in the women's 1,500m in Tokyo, placed fourth in the 3,000m today. Marco Arop, who won two Diamond