Americans Harris English, Kevin Streelman and Russell Henley - and Cameron Davis of Australia - shared the lead at the end of Thursday's first round of The Northern Trust on the PGA Tour. The four carded 7-under-par 64s to head a tight leaderboard. A further seven men - including the likes of Bubba Watson and Louis Oosthuizen - hit 65s. Tiger Woods opened with a 68 with five birdies over his last 10 holes at TPC Boston.