At which tournament did Serena Williams complete the non-calendar-year 'Serena Slam'?

Serena Williams completed the non-calendar-year “Serena Slam” at the 2003 Australian Open.

She arrived in Melbourne holding the 2002 French Open, Wimbledon, and US Open titles. By defeating Venus Williams 7–6(7–4), 3–6, 6–4 in the final, Serena won her fourth consecutive major championship. Because the victories crossed two calendar years, this achievement was a non-calendar-year Grand Slam rather than a calendar-year Grand Slam.

The 2003 Australian Open title was also Serena’s first Australian Open singles championship, her fifth major singles title, and the point at which she completed the career Grand Slam. The tournament’s final was the fourth major final the Williams sisters had played against each other, with Serena winning each one.

A common mix-up is placing the Serena Slam’s completion at the 2002 US Open, where Serena won the third leg of the sequence. The decisive fourth leg came in Australia in January 2003. Serena also survived a dramatic semifinal against Kim Clijsters, saving two match points before reaching the final.