World top 10 ranked players exited the men's, women's and quad singles during a fascinating second day of play at the Melbourne Open, part of the NEC Wheelchair Tennis Tour.
After the departure of world No. 1 Maikel Scheffers on the opening day of competition, it was the turn of world No. 9 and fourth seed Frederic Cattaneo of France to go out of the men's singles on Monday after Britain's Gordon Reid beat Cattaneo for the fourth time in their seven meetings on the NEC Tour.
Reid's 61 76(5) victory earned him a semifinal against Dutch second seed Ronald Vink, who gained the crucial breaks to beat Japan's Takashi Sanada 64 63 in the last eight.
Both quarterfinals in the top half of the draw produced enthralling matches, with Michael Jeremiasz following up his victory over Scheffers with a hard-won victory over Austrian Martin Legner. Jeremiasz gradually found a way past Legner's defences to secure a 26 63 62 victory and will now play Japan's world No. 8 Satoshi in a rematch of last week's Adelaide Open final.
Saida had an even tougher time against young Dutchman Tom Egberink, coming back from the verge of defeat to prevail 26 76(3) 62.
Whiley defeats Kamiji in women's singles
Current and former world No. 1 ranked juniors came together in the second round of the women's singles, with Britain's Jordanne Whiley edging out the current top ranked junior and world No. 9 Yui Kamiji of Japan. After easing through the opening set, Whiley eventually clinched a 60 46 75 victory to book her place in the last eight against German fourth seed Sabine Ellerbrock.
All of the other seven women's matches ended in straight sets, with Ellerbrock defeating Chinese Taipei's Chai-Li Yu 61 61.
World No. 1 Esther Vergeer got her 2012 season off to the best possible start, beating Brazil's Natalia Mayara 60 60 to stretch her winning streak to 435 matches, with world No. 2 Aniek van Koot easing to a 60 63 win over Japan's Miho Nijo.
Vergeer will play South Africa's Kgothatso Montjane in the last eight, while van Koot faces Belgian world No. 7 Annick Sevenans. World No. 4 Marjolein Buis will play will play eighth seed and world No. 11 Katharina Kruger of Germany.
Hasterok edges out Innocenti
American Greg Hasterok registered his second win of 2012 over Italian world No. 10 Marco Innocenti to reach the quad singles semifinals. Hasterok beat second seed Innocenti 64 26 75, while fourth seed John Parfitt of Great Britain also went out ot he event after a 64 62 loss to Japan's Mitsuteru Moroishi.
Top seed Jamie Burdekin led his first match of the new season 5-3 in the opening set against Japan's Shota Kawano when Kawano was forced to retire with mechanical failure to his chair. Burdekin will now play Moroishi in the semifinals, with Hasterok taking on South African third see Lucas Sithole.