Michelsen becomes youngest American to win in Miami since 2017

American Alex Michelsen beat Slovak qualifier Lukas Klein 7-6 (5), 6-2 to advance to the second round of the Miami Masters at the Hard Rock Stadium on Wednesday night.

The 19-year-old becomes the youngest American to win a match at the Miami Open since 2017, when Taylor Fritz and Frances Tiafoe both won.

Michelsen, ranked No 73, will play No 25 seed Tallon Griekspoor next.

Miami Masters 1000, other first-round results (Hard Rock Stadium, hard, USD 10.404.205, most recent results first):

• Dusan Lajovic vs. Gael Monfils
• Alexei Popyrin vs. Facundo Diaz Acosta
• Daniel Elahi Galan vs. Alexander Shevchenko
• Roman Safiullin vs. Diego Schwartzman
• Aleksandar Vukic vs. Roberto Carballes Baena
• Alexandre Muller vs. SoonWoo Kwon
• Emilio Nava vs. Roberto Bautista Agut
• Emil Ruusuvuori vs. Yannick Hanfmann
• Martin Landaluce vs. Jaume Munar
• Aleksandar Kovacevic vs. Fabian Marozsan
• Lorenzo Sonego vs. Daniel Evans
• Sebastian Ofner vs. Kei Nishikori
• Alejandro Tabilo vs. Brandon Nakashima
• Felix Auger-Aliassime vs. Adam Walton
• Daniel Altmaier vs. Harold Mayot
• Laslo Djere vs. Chak Lam Coleman Wong
• Marcos Giron vs. Dominik Koepfer: thursday
• Matteo Arnaldi beat Arthur Fils: 6-3, 6-4
• Martin Damm (WC) beat Zhizhen Zhang: 7-6 (2), 7-6 (3)
• Juncheng Shang (WC) beat Miomir Kecmanovic: 7-6 (5), 4-6, 7-6 (5)
• Thiago Seyboth Wild (Q) beat Nuno Borges: 6-4, 7-5
• Andy Murray beat Matteo Berrettini: 4-6, 6-3, 6-4
• Andrea Vavassori (Q) beat Pedro Cachin: 6-2, 6-2
• Marton Fucsovics beat Max Purcell: 6-2, 6-1
• Tomas Machac beat Darwin Blanch (WC): 6-4, 6-2
• Flavio Cobolli beat Yoshihito Nishioka (LL): 1-6, 6-1, 6-4
• Christopher O’Connell beat Vit Kopriva (Q): 6-2, 6-4
• Jack Draper beat Taro Daniel: 6-3, 6-2
• Denis Shapovalov beat Luciano Darderi: 6-3, 6-7 (3), 6-4
• Botic van de Zandschulp beat Rinky Hijikata: 7-5, 7-6 (3)
• Luca Van Assche beat Pavel Kotov: 6-3, 7-5