The 2020 Split Open was a professional tennis tournament played on clay courts. It was part of the 2020 ATP Challenger Tour. It took place in Split, Croatia between 28 September and 4 October 2020.

Country	Player	Rank1	Seed
POR	Pedro Sousa	113	1
SVK	Jozef Kovalík	124	2
USA	Bradley Klahn	134	3
ESP	Carlos Taberner	148	4
SRB	Danilo Petrović	159	5
SVK	Martin Kližan	162	6
NED	Botic van de Zandschulp	165	7
JPN	Tatsuma Ito	166	8

• Rankings are as of 21 September 2020.^[1]

The following players received wildcards into the singles main draw:

• Duje Ajduković
• Borna Gojo
• Nino Serdarušić

The following player received entry into the singles main draw as a special exempt:

• Tomás Martín Etcheverry

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

• Maximilian Marterer

The following players received entry from the qualifying draw:

• Marcelo Tomás Barrios Vera
• Altuğ Çelikbilek
• Malek Jaziri
• Peđa Krstin

• Francisco Cerúndolo def. Pedro Sousa 4–6, 6–3, 7–6^(7–4).

• Treat Huey / Nathaniel Lammons def. André Göransson / Hunter Reese 6–4, 7–6^(7–3).