The 2015 Mersin Cup was a professional tennis tournament played on clay courts. It was the 4th edition of the tournament which was part of the 2015 ATP Challenger Tour. It took place in Mersin, Turkey between April 13 and 19.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Serbia | Filip Krajinović | 86 | 1 | |
 Bosnia and Herzegovina | Damir Džumhur | 87 | 2 | |
 Turkey | Marsel İlhan | 96 | 3 | |
| Tobias Kamke | 114 | 4 | ||
 Russian Federation | Alexander Kudryavtsev | 127 | 5 | |
 Moldova, Republic of | Radu Albot | 133 | 6 | |
 Georgia | Nikoloz Basilashvili | 137 | 7 | |
 Romania | Victor Hănescu | 140 | 8 |
The following players received wildcards into the singles main draw:
Anıl Yüksel Barış Ergüden Efe Yurtacan Cem İlkelThe following players received entry into the singles main draw as a special exempt:
The following players received entry from the qualifying draw:
The following players received entry as a lucky loser:
See main article: 2015 Mersin Cup – Singles.
Kimmer Coppejans def. Marsel İlhan, 6–2, 6–2See main article: 2015 Mersin Cup – Doubles.
Michael Venus def. 
Riccardo Ghedin / 
Ramkumar Ramanathan, 5–7, 6–3, [10–4]
