Andrew Dent reports
After sharing the opening two games, Richards stepped up his game to overcome Cuskelly 11-7, 9-11 11-4, 11-4 in just over an hour.
Cuskelly was matching it with his higher ranked opponent for the first two games, but when Richards changed his game plan at the start of the third, the Englishman was able to take control over his increasingly frustrated opponent.
“He was playing really well at the end of the second, hitting nicks and winners, so I went back to basics,” Richards said. “I decided to be patient and wait for the best for the best opportunities to go in and attack.
“I knew on paper that Ryan was one of the toughest players to draw in the second round, so I was mentally prepared for it tonight.”
Clyne and Knight were evenly matched throughout and the New Zealander had three game points to make it two games apiece. But Clyne battled back to save all three then take the match on extra points.
“Ground out a 3-1 win tonight and it was a bit of a grind,” the Scot tweeted. “An 83 minute longie. Into the quarters though to play Tom Richards on Friday.”
Second seed Omar Mosaad was also taken to four games, by Czech Jan Koukal. After winning the first two games relatively comfortably, Mosaad had to hold off an inspired fight back from the Czech and was lucky not be taken to five games.
He takes on Malaysia’s Ong Beng Hee, who was the first man through to the quarter-finals when he beat young Egyptian Amr Khaled Khalifa 11-9, 8-11, 11-7, 11-7.
“I was pretty confident going into the match,” Ong said. “After my performance yesterday I felt pretty good on court, I’m feeling a bit more comfortable as the days go by but I think the pressure was still on me today because I was playing an extremely talented young Egyptian.
“He’s only 19 years old and absolutely talented with his racquet, so skilful. I think my experience got me through, especially on the bigger points so I’m quite happy with my performance.
“It’s a long time since I’ve been in the quarter-finals of a major event – I’m very pleased.”
Men’s Round Two (bottom half): Tom Richards (Eng) bt Ryan Cuskelly (Aus) 11-7, 9-11, 11-4, 11-4 (63m)
 Alan Clyne (Sco) bt Martin Knight (Nzl) 11-7, 7-11, 11-8, 13-11 (83m)
 Ong Beng Hee (Mas) bt Amr Khaled Khalifa (Egy) 11-9, 8-11, 11-7, 11-7 (60m)
 Omar Mosaad (Egy) bt Jan Koukal (Cze) 11-7, 11-8 8-11, 13-11 (50m)