2018 Knoxville Challenger
Date	5–11 November
Edition	15th
Surface	Hard
Location	Knoxville, United States
Champions
Singles
Reilly Opelka
Doubles
Toshihide Matsui / Frederik Nielsen
← 2017 · Knoxville Challenger · 2019 →

The 2018 Knoxville Challenger was a professional tennis tournament played on indoor hard courts. It was the fifteenth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Knoxville, United States between 5 and 11 November 2018.

Singles main-draw entrants

Seeds

Country	Player	Rank1	Seed
USA	Tennys Sandgren	62	1
ESP	Marcel Granollers	98	2
USA	Bradley Klahn	101	3
USA	Michael Mmoh	102	4
USA	Tim Smyczek	120	5
TPE	Jason Jung	126	6
CAN	Peter Polansky	130	7
USA	Reilly Opelka	134	8

• ¹ Rankings are as of October 29, 2018.^[1]

Other entrants

The following players received wildcards into the singles main draw:

• Tennys Sandgren
• Timo Stodder
• Preston Touliatos
• J. J. Wolf

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

• Tommy Paul

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

• Christian Harrison
• Mitchell Krueger

The following players received entry from the qualifying draw:

• Emilio Gómez
• Michael Redlicki
• Evan Song
• Mikael Ymer

Champions

Singles

• Reilly Opelka def. Bjorn Fratangelo 7–5, 4–6, 7–6^(7–2).

Doubles

• Toshihide Matsui / Frederik Nielsen def. Hunter Reese / Tennys Sandgren 7–6^(8–6), 7–5.