It came in an event doubling as a leg on the UNIQLO Wheelchair Tennis Tour at the Chikuho Heights Tennis Courts in Iizuka.

Alcott, the top seed, battled from a set down to defeat British rival Andy Lapthorne.

The third seed had been in rampant form to win the first set 6-4 before losing the next two 6-4, 6-0.

Second seed Wagner was more comfortable in cruising past fourth ranked South African Lucas Sithole 6-2, 6-3.

All four top seeds also qualified for semi-finals in the men's singles today.

Top ranked Stephane Houdet of France beat Japan's Takuya Miki 7-5, 3-6, 6-3 while team-mate Nicolas Peifer defeated Britain's Alfie Hewett 6-3, 6-2.

Home hopes were ended as Takashi Sanada lost 6-3, 4-6, 6-2 to Argentinian third seed Gustavo Fernandez.

British second seed Gordon Reid thrashed Dutchman Maikel Scheffers 6-2, 6-1.

There were better fortunes for the host nation in the women's singles as top seed Yui Kamiji overcame Lucy Shuker 6-3, 6-1.

Anied van Koot and Diede de Groot both enjoyed victories on a good day for The Netherlands.

Van Koot won 6-1, 6-1 over Germany's Katharina Kruger while de Groot was made to work harder before getting the better of South Africa's Kgothatso Montjane 5-7, 6-3, 7-6.

Thailand's Sakhorn Khanthasit also progressed after knocking-out fifth-seeded German Sabine Ellerbrock 6-1, 6-1.

Competition will continue tomorrow.