Betting on these on Anonibet (Wednesday/Thursday Matches)...

Parlay:

Aljaz Bedene versus Filip Veger | Aljaz Bedene ML 1.22
Tim Smyczek versus Christian Harrison | Tim Smyczek ML 1.29
Michael Russell versus Michael Quintero | Michael Russell ML 1.16
Adrian Ungur versus Lorenzo Giustino | Adrian Ungur ML 1.24

Total: 2.26

According to http://www.tennisabstract.com/, a tennis sabermetrics and analysis site, all of these players have over an 85% chance of winning their respective matches.
Aljaz Bedene: 94.1%
Tim Smyczek: 85.1%
Michael Russell: 97.5%
Adrian Ungur: 87.7%

ATP Rankings:
Aljaz Bedene: #90 versus Filip Veger: #764
Tim Smyczek: #120 versus Christian Harrison: #357
Michael Russell: #95 versus Michael Quintero: #433
Adrian Ungur: #94 versus Lorenzo Giustino: #336

I do not see any of the players on the right-hand side winning. They're just simply outmatched.