West Brom continued their unbeaten start to the season by coming from a goal down to record a relatively comfortable win over Plymouth.
Jamie Mackie fired across keeper Scott Carson before Shelton Martis equalised for West Brom as he got the final touch to Jonas Olsson's near-post header.
Marek Ceck then ended an excellent Baggies move by drilling in a shot.
A Karl Duguid strike hit the crossbar for Plymouth before Cech headed a third for the hosts to wrap up the points.
Plymouth have struggled so far this season but they certainly provided West Brom with a tough challenge before leaving the Hawthorns pointless.
It could have been a different story for the visitors had Gary Sawyer not wasted a glorious chance to make it 2-0 midway through the first half.
Sawyer headed down but wide with the goal gaping before the Baggies recovered from going a goal down for the first time this season.
West Brom boss Roberto di Matteo:"Getting the equaliser and a second goal before half-time was important and we were better in the second-half.
"We are top of the league and we will enjoy that. We are also still unbeaten and we will enjoy that as well.
"We have our philosophy of how we want to play and we can score from anywhere in the team, which is important."
Plymouth boss Paul Sturrock:"We have lost too many from set-pieces. We just need a wee break because at 2-1 down we hit the bar.
"The important thing is that we get just three points from somewhere.
"Even if it's the worst performance of our lives and the ball goes in off someone's backside. That's all I want."