Gould, 39, edged 20-year-old Chinese hopeful Yan Bingtao 5-4 to set up a semifinal clash with Trump, where he took three frames in a row after the scores were tied at 3-3 to knock out the top seed.
Mexico had been due to face Costa Rica on the same day, but the Central American team withdrew on Tuesday because their players faced a two-week quarantine upon returning home.
Yunnan made more errors in the second set, especially in serve and back court receiving, only to witness Beijing take the set again.
After both sides traded points in the beginning of the second set, Li scored a pair of spikes to initiate Tianjin's 9-1 run, which Hebei failed to cut it until the end of the set.
The Belgian then played a major role in the second goal in the 33rd minute, setting up Raheem Sterling, whose ball into space was put into the empty net from 10 yards by Phil Foden.
Monday's first game saw Aston Villa beat Sheffield United 1-0 in Villa Park on a 63rd minute goal by Ezri Konsa Ngoyo.
Viera bagged his second with a stunning free kick in the 56th minute, before Cedric Bakambu added the fifth in the 85th minute.
The WTT Champions Series will also see players battling for prize money and ranking points in their attempt to reach the WTT Cup Finals.
In the women's singles, Serena Williams is eyeing her 24th major to equal Margaret Court's long-standing record. She will encounter with fellow American Kristie Ahn, whom she also played with in the US Open first round earlier this month.
With the win, Guangzhou climbed to sixth in the league, only one point behind the fourth Shanghai Shenhua, while Dalian dropped to seventh. Enditem
Leipzig, however, responded straight away and pressed Mainz on the back foot to restore their two-goal lead three minutes later as Haidara made no mistake to tap home Forsberg's square pass.