So it took five sets for Dimitrov to defeat Federer. The 28-year-old Bulgarian now meets Russian Daniil Medvedev in the semi-finals.
Roger Federer knocked out of the US Open
Roger Federer is knocked out of the US Open. Grigor Dimitrov outscored the Swiss by 3-2 in sets, 3–6, 6–4, 3–6, 6–4, 6–2.