Click on the video player above&nbsp;to watch coverage from&nbsp;IAAF Diamond League track and field event in Doha.

Semenya to run in Doha Diamond League as storm rages over new IAAF rules

Double Olympic champion Caster Semenya will run her last 800 metres on Friday before the International Association of Athletics Federations (IAAF) imposes hugely controversial new rules limiting testosterone in female athletes.

South Africa's runner Caster Semenya, current 800-metre Olympic gold medallist and world champion, arrives for the first day of her hearing at the international Court of Arbitration for Sport, CAS, in Lausanne, Switzerland on Monday.

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South African runner Caster Semenya, shown in February 2019 arriving at a hearing at the international Court of Arbitration for Sport in Lausanne, Switzerland, will race on Friday at the Doha Diamond League event following the testosterone ruling.

Sprinter Aaron Brown eases into season, plans to peak at world championships

Aaron Brown envisions running sub-19.90 seconds over 200 metres this season, though it was probably a stretch to have expected such a result in the first Diamond League race of 2019 in Doha, Qatar, on Friday.

Aaron Brown of Toronto has focused part of his early-season training on the final 50 metres of the 200, his nemesis throughout last season. Improvement in this area, Brown says, will help him run sub-19.90 seconds in 2019. He clocked 20.20 in Friday's Diamond League season opener.

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Canada's Aaron Brown competes in the men's 200m&nbsp;and Caster Semenya of South Africa races in the women's 800m&nbsp;at the season-opening meet in Qatar.

For more track and field coverage, tune into&nbsp;

Coverage of the IAAF Diamond League from Doha, Qatar on CBC.

Watch the Diamond League track & field event in Doha

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