* Dawson scored twice as West Brom beat Arsenal 3-1 at Hawthorns
* The defender headed the home side into a 12th-minute lead
* Sanchez equalised with a clinical finish three minutes later
* Substitute Robson-Kanu restored West Brom's lead after the break
* Dawson sealed the home side's win with a powerful header
* The result piled more pressure on Arsenal manager Arsene Wenger
* Arsenal at home to Manchester City in the next round; West Brom visit Manchester United
March 18 (Reuters) - Two headers by Craig Dawson and a Hal Robson-Kanu strike lifted West Bromwich Albion to a 3-1 win over Arsenal and piled more misery on their manager Arsene Wenger after a pulsating Premier League clash on Saturday.
The result left Arsenal, still reeling from a 10-2 aggregate defeat by Bayern Munich in the Champions League last 16, in fifth place, five points behind fourth-placed Liverpool. West Brom stayed eighth on 43 points.
Dawson fired the home side ahead in the 12th minute after a Nacer Chadli corner before Alexis Sanchez levelled three minutes later with a composed finish from a delightfully weighed pass by midfielder Granit Xhaka.
Robson-Kanu restored West Brom's lead in the 55th minute with an opportunist finish 75 seconds after replacing Salomon Rondon and Dawson sealed the win with a thumping close-range header from a James McLean corner. (Writing by Zoran Milosavljevic; Editing by Clare Fallon)