World-class saves in either half from Jussi Jaaskelainen and Scott Carson helped ensure Bolton and West Brom played out a goalless draw at the Reebok Stadium in a game which sprung to life after the break.
In an instantly forgettable first half Jaaskelainen's effort was by far the most memorable moment, the long-serving Bolton stopper spectacularly denying James Morrison's curling shot from 25 yards out at the expense of a corner.
After the break, the game increasingly opened up and, after Carson pulled off an equally stunning stop to deny Riga Mustapha, both sides came agonisingly close to winning it in the last 15 minutes.
The visitors saw a cracking drive from Do-Heon Kim hit the bar and bounce down on the line, with Jaaskelainen denying Ishmael Miller from the rebound, while the Trotters saw two late 'goals' from Kevin Davies chalked off by the flag of the referee's assistant.
Bolton had the first chance of the game after five minutes when Ricardo Gardner was fouled 30 yards out, and Joey O'Brien's free-kick was only just too long for Gavin McCann, who could only fire into the side-netting.
Almost immediately at the other end, Morrison cut through the Bolton defence and, although it looked like he had created a decent chance for himself, he cut the ball across from the left channel and Miller's shot was deflected over.
And the visitors came within a fingertip of taking the lead midway through the first half when Morrison's curling shot from 25 yards was superbly turned round the left-hand post by Jaaskelainen.
A wonderful passing move down the left then released Albion new-boy Valero, but the former Real Mallorca playmaker's shot towards the far corner lacked any real sting and Jaaskelainen made the comfortable save.
The game then sprang to life on the hour mark, when Miller collected a through-ball for Albion only to fire just over from the edge of the six-yard box.
Then, at the other end, Riga was adjudged to have been brought down inches outside the penalty area by Paul Robinson and, although the left-back looked to have won the ball fairly, a yellow card was also brandished in his direction.
Both sides came close to a late winner, the Baggies being denied by the width of the goal-line when Kim's 30-yard drive bounced down off the crossbar onto the line and into the path of Miller, whose effort was parried to safety at point-blank range by Jaaskelainen.
Then it was Bolton's turn to suffer when the referee adjudged Greening to have handled a shot from Nolan only to again give a free-kick on the edge of the area when the offence - if indeed it did hit the hand - looked to have taken place just inside.
Riga again stepped up, but this time his shot flew the wrong side of the post.
Bolton nearly nicked it with five minutes remaining, when a Nolan shot was blocked into the path of Davies, but his fierce shot into the roof of the net was rightfully ruled out for offside, and the striker knew it was not to be his day when he saw a second effort ruled out for offside in the last minute.