Second-seeded Li Na beat Kristyna Pliskova 7-6 (5), 6-3 Monday in the first round of the Danish Open.
Li broke Pliskova in the fourth game of the first set to lead 3-1, but the 241st-ranked Pliskova broke back to force a tiebreaker. Li broke once in the second set to close out the indoor hard-court match.
Fifth-seeded Julia Goerges hit six aces on the way to beating Stefanie Voegele 6-2, 6-4.
Top-seeded Caroline Wozniacki takes on Petra Martic on Tuesday.