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Reid had won the last four matches against Fernandez
Paralympic Games in Tokyo, Japan on BBC Dates: 24 Aug-5 Sep Time in Tokyo: BST+8 Coverage: Follow Radio 5 Live or on the BBC Sport Website
With a win in three sets over Gustavo Fernandez from Argentina, Gordon Reid, the defending champion, reached the Tokyo Paralympics men's singles semifinal.
In just two and a quarter hours, the British fifth seed defeated the number four world player 7-5 3-6 6-1
Alfie Hewett, a fellow Briton, won silver in Rio and is now in the fourth round after defeating Nicolas Peifer, France, 6-3, 6-3.
Reid will take on Shingo Kunieda, the world number one and favourite of Reid for a spot in the final. Hewett is up against second seed Hewett or Tom Egberink from the Netherlands or Daniel Caverzaschi from Spain.
Britain is guaranteed a medal at the men's singles. This is because Reid and Hewett would lose their semi-finals. They would then play each other in a bronze medal play-off.
Earlier, Victoria Rumary, an archer, won bronze for GB at the women's W1 event. After losing to China in the semifinals, there was table tennis bronze for the class 8, which included Aaron McKibbin, Ross Wilson and Billy Shilton.
David Smith, Boccia player, bids to keep his BC1 individual title starting at 08:50 BST against Malaysian's Chew Wei Lun.
Canada will face the GB men's wheelchair basketball team in the quarter-finals at 10.15, as they attempt to add Paralympic gold and European and world titles.
Becky Redfern, a swimmer who gave birth in July 2020 to her son Patrick, was second fastest for the SB13 100m Breaststroke final (11:09).
Sammi Kinghorn, a 2017 world champion in the T53 100m, is vying for a medal