Americans Jack Sock, Steve Johnson and John Isner are flying the locals' flag high at the Citi Open at Washington DC.
Jack Sock downed Richard Gasquet at the Citi Open on Thursday, joining fellow American Steve Johnson in scalping a top-six seed.
Sock, seeded 15th, edged Gasquet 6-7 (4-7) 7-6 (7-5) 6-4, earning the only break of the deciding set in the fifth game before sending the fourth seed packing from Washington DC.
Meanwhile, Johnson upended sixth seed Grigor Dimitrov 6-3 1-6 6-3 to reach his fourth ATP World Tour quarter-final of the season.
Sock and Johnson will play off in the quarter-finals, guaranteeing one local entrant in the semis.
Also still in the hunt for the Americans is eighth seed John Isner, who earned the only break of serve of his match in the first game against Vasek Pospisil to post a 6-4 7-6 (8-6) victory.
Isner will meet unseeded Lithuanian Ricardas Berankis, who downed Andy Murray's conqueror Teymuraz Gabashvili 7-5 6-4.
Kei Nishikori and Marin Cilic remain on track for a semi-final blockbuster in the bottom half of the draw following two-set wins.
Second seed Nishikori accounted for 16th seed Leonardo Mayer 6-4 6-4, while Cilic - seeded third - came from a break down in the second set to beat 13th seed Sam Querrey 7-6 (7-2) 7-6 (7-3).
Nishikori will face Sam Groth in the last eight, after the Australian surpassed seventh seed Feliciano Lopez 6-3 6-4.
German prodigy Alexander Zverev is awaiting Cilic in the quarters, after he came back to beat Alexandr Dolgopolov 2-6 6-2 6-4.