Towards the end of 2008, Keizer changed partners once again and paired up with Marleen van Iersel. She began to see better results on the international circuit, including her first World Tour podium at the $190K Japan Open in the spring of 2009. After losing their first match, the 13th-seeded Keizer and van Iersel won six consecutive matches to reach the final four, recording upsets over two top-five seeds along the way. They lost to Brazil's top-seeded Juliana Silva and Larissa França in the semifinals, then went on to beat the USA's 26th-seeded Angie Akers and Tyra Turner in the bronze-medal match. The bronze in Japan was only the second time a Dutch women's team had ever won a World Tour medal. Another bronze-medal match-up followed at the $300K Gstaad Grand Slam two months later. This time, the Dutch No. 13 seeds lost to the fourth-seeded Nicole Branagh and Elaine Youngs of the United States in two sets. Keizer and van Iersel also competed at the 2009 World and European Championships, and were stopped in the quarterfinals of both tournaments. They were the sixth-ranked team in the world at the end of the year.