Middlesbrough FC ended Arsenal’s unbeaten start to the Premier League season with a 2-1 win at the Riverside on Sunday.A Stewart Downing penalty and a Tuncay Sanli strike, his second in two games, earned the Teessiders the win - their first in the Premier League since September 1 - and also denied the Gunners the chance to stretch their one-point lead at the top of the table.