Leyton Orient forced a battling goalless draw with a previously-rampant Walsall side in an enthralling and wet clash at Banks's Stadium.
Both sides played excellent football on the rain-soaked pitch. Saddlers defender Anthony Gerrard did well to block a shot from Wayne Corden in the 17th minute.
Walsall's first effort arrived four minutes later when a free-kick from Lee Holmes was deflected over the visitors' bar.
Holmes cut inside after 33 minutes to hit a rising drive which Stewart Nelson held under the bar.
Walsall dominated the second half Edrissa Sonko shot wide after good work by Holmes and Tommy Mooney.
The Saddlers missed a great chance to win it in the 63rd minute when Holmes crossed to the far post where Darren Wrack headed wide. In extra time, Mooney had a header saved and Orient replied with Adam Boyd having a drive saved.