• coign of vantage, inside track, place of vantage, point of vantage, vantage-ground, vantage-point
• have the blue chips on one's side, the balance of advantage lies with him, to be on the inside track, to be on the track inside
• to give a favourable account of sg
• in one's best bib and tucker
• to press one's advantage
• to put sg to account, to put sg to good account, to turn sg to account, to turn sg to good account
• have the best of the running