GLASGOW, March 3 — Record-setting Femke Bol proved unstoppable and Grant Holloway extended his 10-year win streak at a high-octane second day of the world indoor championships in Glasgow on Saturday that also featured double British gold.

Bol once again stole the show, the two-time world 400m hurdles champion bettering her own world indoor record to 49.17 seconds to win the 400m, leading from gun to tape in an exceptional display of running.