Johanna Konta's 300th career win came against fellow Brit Tara Moore on Tuesday.
British No 1 Konta was leading 6-2 3-0 in the first round of the Aegon Open in Nottingham when Moore retired with an injury to her left foot.
Two breaks gave Konta a straightforward opening set and she continued to dominate Moore before the match's early ending.
Konta, the top seed at the tournament, received a bunch of flowers on court after her milestone win.
She will play Yanina Wickmayer in the next round.
Elsewhere at the Aegon Open, Donna Vekic beat sixth seed Shelby Rogers 6-4 6-3, Maria Sakkari defeated Jana Cepelova 7-6 5-7 7-6 and Magdalena Rybarikova eliminated Dayana Yastremska with a 6-1 6-2 win.
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