Roger Federer was in clinical mood as he saw off Spain's Feliciano Lopez in straight sets to join Rafael Nadal in the US Open fourth round.
The third seed, who came through five‑set matches in the first two rounds, beat 35‑year‑old Lopez 6‑3 6‑3 7‑5.
Five‑time champion Federer, 36, goes on to face Germany's Philipp Kohlschreiber in the last 16.
