2026 San Diego Open

The 2026 San Diego Open was a professional tennis tournament played on hardcourts. It was the second edition of the tournament as an ATP Challenger Tour event which was part of the 2026 ATP Challenger Tour. It was also the first edition of the tournament as part of the 2026 ITF Women's World Tennis Tour. It took place in San Diego, United States from 27 January to 1 February 2026.

• ¹ Rankings are as of 19 January 2026.^[1]

The following players received wildcards into the singles main draw:

• Sebastian Korda
• Colton Smith

The following players received entry into the singles main draw as alternates:

• Blaise Bicknell
• Micah Braswell
• Raphael Perot
• Keegan Smith

The following players received entry from the qualifying draw:

• Bor Artnak
• Felix Corwin
• Stefan Dostanic
• Fryderyk Lechno-Wasiutyński
• Karl Poling
• Evan Zhu

• ¹ Rankings are as of 19 January 2026.

The following players received wildcards into the singles main draw:

• Jennifer Brady
• Katherine Hui
• Alexis Nguyen

The following player received entry into the singles main draw using a special ranking:

• Kayla Day
• Catherine Harrison

The following players received entry from the qualifying draw:

• Ema Burgić
• Jo-yee Chan
• Kylie Collins
• Gina Feistel
• Lina Glushko
• Kristina Liutova
• Ava Markham
• Ella McDonald

• Zachary Svajda def. Sebastian Korda 6–4, 7–6^(7–5).

• Trey Hilderbrand / Mac Kiger def. Garrett Johns / Karl Poling 6–3, 6–4.

• Elvina Kalieva def. Elizabeth Mandlik 3–6, 6–3, 6–1.

• Kayla Cross / Alana Smith def. Catherine Harrison / Dalayna Hewitt 6–2, 6–3.