In the men's singles class 10, Daybell defeated Austria's Gustav Wiesenhofer 11-5, 11-9, 11-5 in straight games before defeating Thailand's Bunpot Sillapakong 17-5, 11-5, 11-8 to top Group D.

Daybell is one of the favourites to qualify for the Games, having reached the quarter-finals at the Rio 2016 Paralympics and later winning silver at the Gold Coast 2018 Commonwealth Games.

Elsewhere in the group, Germany's Mio Wagner defeated Sillapakong in five games 11-8, 11-9, 4-11, 8-11, 11-9, but later lost to Wiesenhofer 10-12, 11-4, 11-7, 11-8.

In Group A, Poland's Igor Misztal won both of his matches - first winning 11-7, 11-8, 5-11, 11-2 against the Czech Republic's Tibor Chmela, before beating Italy's Lorenzo Cordua 11-9, 11-7, 11-7.

France's Gilles De La Bourdonnaye is top of Group B following two victories - first against Algeria's Karim Boumedouha 11-1, 11-4, 9-11, 11-4, and then Japan's Nariaki Kakita 11-8, 11-8, 11-6.

Montenegro's Luka Bakic won both his matches in Group C, first defeating Iraq's Abdulrahman Hikmat Shafeeq 6-11, 11-3, 15-13, 11-8, and then Brazil's Claudio Massad 11-7, 11-4, 11-9.

Chinese Taipei's Jin Sian Su finished the first day in Group E with two wins too, with the first being a five game thriller against Jerry Vasquez, coming from two down to win 11-13, 8-11, 11-7, 11-7, 11-1.

He then defeated Russian Pavel Lukyanov 11-3, 11-5, 8-11, 13-11.

Elsewhere in the group, Lukyanov defeated Chile's Gustavo Ignacio Castro Serrano 11-8, 11-4, 11-6, while Vasquez won 11-8, 11-8, 11-7 against the Chilean.