The Gulls edged Ostbridge Mariners 104-101 after two extra periods at the Harbourside Arena, with the final basket coming with four seconds left on the clock.
Imogen Hart clocked 52.41 seconds at the regional open meeting, taking almost three tenths off a mark that had stood since before she started running competitively.
More than 600 swimmers from 28 clubs are competing at the city aquatics centre over four days, and the host club made a fast start in the 50-metre pool.
Crews from 41 clubs raced over two days on the stretch between Millbrook and the city, making this year's anniversary regatta the largest in its history.
Patched goalmouths, rusted frames and waterlogged corners will be tackled in a phased programme, with the first 20 sites chosen after residents and local clubs flagged the worst problems.
The city's 3x3 basketball league has more than doubled in size, with games on outdoor courts in five parks and professional players from the Wrenhaven Gulls helping out on the sidelines.