# 2018 Tiburon Challenger – Singles

Cameron Norrie was the defending champion but chose not to defend his title.
Michael Mmoh won the title after defeating Marcel Granollers 6–3, 7–5 in the final.

## Seeds

* Marcel Granollers (final)
* Jordan Thompson (first round)
* Peter Polansky (second round)
* Henri Laaksonen (first round)
* Michael Mmoh (champion)
* Noah Rubin (semifinals)
* Marc Polmans (first round)
* Bjorn Fratangelo (second round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Marcel Granollers | 6 | 6 | | | | | |
| 6 | Noah Rubin | 2 | 2 | | | | | |
| 6 | Noah Rubin | 2 | 2 | | 1 | Marcel Granollers | 3 | 5 |
| | | | | | 5 | Michael Mmoh | 6 | 7 |
| 5 | Michael Mmoh | 6 | 3 | 6 | 5 | Michael Mmoh | 6 | 7 |
| Alt | James Duckworth | 3 | 6 | 3 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | M Granollers | 6 | 7 | | | | | | | | | | | | | | |
| | E King | 2 | 5 | | 1 | M Granollers | 6 | 7 | | | | | | | | | |
| Q | C İlkel | 4 | 6 | 6 | Q | C İlkel | 2 | 5 | | | | | | | | | |
| | L Miedler | 6 | 4 | 3 | | | | | | 1 | M Granollers | 6 | 6 | | | | |
| | J-P Smith | 6 | 6 | | | | | | | | J-P Smith | 2 | 3 | | | | |
| | P Martínez | 4 | 2 | | | J-P Smith | 1 | 6 | 6 | | | | | | | | |
| | P Krstin | 0 | 3 | | 8 | B Fratangelo | 6 | 4 | 2 | | | | | | | | |
| 8 | B Fratangelo | 6 | 6 | | | | | | | | | | | 1 | M Granollers | 6 | 6 |
| 3 | P Polansky | 6 | 6 | | | | | | | | | | | 6 | N Rubin | 2 | 2 |
| WC | T Fawcett | 4 | 4 | | 3 | P Polansky | 3 | 3 | | | | | | | | | |
| | C Eubanks | 7$^7$ | 7$^7$ | | | C Eubanks | 6 | 6 | | | | | | | | | |
| | R Quiroz | 6$^4$ | 6$^4$ | | | | | | | | C Eubanks | 4 | 3 | | | | |
| | J Clarke | 2 | 6$^5$ | | | | | | | 6 | N Rubin | 6 | 6 | | | | |
| WC | JC Aragone | 6 | 7$^7$ | | WC | JC Aragone | 6$^3$ | 4 | | | | | | | | | |
| | T de Bakker | 0 | 0 | | 6 | N Rubin | 7$^7$ | 6 | | | | | | | | | |
| 6 | N Rubin | 6 | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | M Mmoh | 6 | 6 | | | | | | | | | | | | | | | | |
| | D King | 2 | 4 | | 5 | M Mmoh | 6 | 3 | | | | | | | | | | | |
| | E Escobedo | 6 | 7$^7$ | | | E Escobedo | 2 | 0$^r$ | | | | | | | | | | | |
| Q | R Ortega Olmedo | 1 | 6$^2$ | | | | | | | 5 | M Mmoh | 7$^9$ | 2 | 6 | | | | | |
| WC | B Holt | 6 | 7$^7$ | | | | | | | WC | T Paul | 6$^7$ | 6 | 3 | | | | | |
| Q | S Diez | 3 | 6$^4$ | | WC | B Holt | 0$^r$ | | | | | | | | | | | | |
| WC | T Paul | 6 | 6 | | WC | T Paul | 5 | | | | | | | | | | | | |
| 4 | H Laaksonen | 4 | 3 | | | | | | | | | | | | 5 | M Mmoh | 6 | 3 | 6 |
| 7 | M Polmans | 4 | 4 | | | | | | | | | | | | Alt | J Duckworth | 3 | 6 | 3 |
| | A Popyrin | 6 | 6 | | | A Popyrin | 6 | 6$^2$ | 6$^6$ | | | | | | | | | | |
| Q | A Sarkissian | 6$^1$ | 4 | | Alt | J Duckworth | 4 | 7$^7$ | 7$^8$ | | | | | | | | | | |
| Alt | J Duckworth | 7$^7$ | 6 | | | | | | | Alt | J Duckworth | 7 | 6 | | | | | | |
| SE | M Torpegaard | 6 | 6 | | | | | | | | M Arévalo | 5 | 3 | | | | | | |
| | M Banes | 4 | 2 | | SE | M Torpegaard | 3 | 6 | 3 | | | | | | | | | | |
| | M Arévalo | 2 | 7$^7$ | 7$^7$ | | M Arévalo | 6 | 0 | 6 | | | | | | | | | | |
| 2 | J Thompson | 6 | 6$^2$ | 6$^5$ | | | | | | | | | | | | | | | |