The Owls posted a resolute performance in holding high-flying Watford to a goalless draw in Hertfordshire.
Wednesday knocked on the door on numerous occasions and enjoyed more of the possession but the hosts displayed their top-two credentials in keeping the visitors at bay.
Watford custodian Andrew Thomas saved his team twice either side of half time with cracking saves, most notably from a Jordan Lonchar strike that he somehow tipped onto the crossbar in the second period.
Prior to that, Thomas denied Mason Duffy when the midfielder bore down on goal as the Owls asked more of the questions.
Watford pressed more after the break but a determined Wednesday side dug deep ensure a clean sheet and share of the spoils.
Coach Paul Murray said: “The boys deserve a lot of credit because Watford are a very good side and were fresh coming into the game having not played since January.
“I was particularly pleased with the second half performance. Our passing and positioning was very good, with most of the team playing at their best.”