ITF M25 Lajeado 11/25 21:40 27 Nicolas Zanellato v Guilherme Clezar 6-2,7-5
ITF M25 Lajeado 11/24 21:25 26 Enrique Bogo v Guilherme Clezar 5-7,0-6
ITF M25 Lajeado 11/23 13:00 25 Guilherme Clezar v Arklon H D Pino 7-6,6-3
Challenger de Río de Janeiro 12/14 13:00 25 [313] Genaro Alberto Olivieri v Guilherme Clezar [431] 5-7,6-4,6-3
Challenger Florianópolis 12/06 19:00 25 [427] Guilherme Clezar v Johan Nikles [349] 3-6,7-6,2-6
ATP Santiago 03/06 18:20 14 [279] Guilherme Clezar v Felipe M R Alves [236] 4-6,2-6
ATP Buenos Aires 02/28 14:00 15 [278] Guilherme Clezar v Francisco Cerundolo [135] 6-2,3-6,2-6
ATP Buenos Aires 02/27 16:35 14 [369] Hernan Casanova v Guilherme Clezar [278] 6-1,3-6,3-6
ATP Cordoba 02/20 21:05 14 [272] Guilherme Clezar v Renzo Olivo [216] 4-6,4-6
Challenger de Concepción 02/15 16:35 25 [272] Guilherme Clezar v Marcelo Tomas Barrios Vera [260] 2-6,2-6
Challenger de Campinas 12/01 17:20 25 [270] Guilherme Clezar v Facundo Mena [238] 4-6,4-6
Challenger de Cary 11/10 16:00 25 [84] Thiago Monteiro v Guilherme Clezar [268] Retired
Challenger de Lisboa 10/16 10:25 27 [270] Guilherme Clezar v Federico Gaio [136] 7-5,4-6,6-7
Challenger de Lisboa 10/15 12:30 26 [500] Nuno Borges v Guilherme Clezar [270] 3-6,6-7
Challenger de Lisboa 10/13 09:00 25 [206] Maxime Janvier v Guilherme Clezar [270] 6-7,2-6
Challenger de Lisboa 10/11 10:30 164 [263] Guilherme Clezar v Orlando Luz [309] 6-4,6-3
Challenger de Lisboa 10/10 11:30 64 Guilherme Clezar v Joao Monteiro 6-7,6-4,6-1
Challenger de Barcelona 10/03 13:10 26 [201] Brandon Nakashima v Guilherme Clezar [263] 6-2,6-2
Challenger Split 09/27 08:00 164 [273] Guilherme Clezar v Marcelo T B Vera [284] 2-6,3-6
Challenger Split 09/26 13:55 64 Guilherme Clezar v Duje Kekez 6-2,6-3
Challenger de Forlì 09/24 09:55 27 [273] Guilherme Clezar v Andrea Pellegrino [343] 4-6,2-6
Challenger de Forlì 09/23 10:45 26 [98] Federico Coria v Guilherme Clezar [273] 6-7,7-6,4-6
Challenger de Forlì 09/21 08:00 25 [273] Guilherme Clezar v Matthias Bachinger [272] 7-6,3-6,6-3
ITF M25 Plaisir 09/18 11:00 27 Igor Sijsling v Guilherme Clezar 6-4,6-4
ITF M25 Plaisir 09/17 10:20 26 Valentin Royer v Guilherme Clezar 7-6,6-7,4-6
ITF M25 Plaisir 09/16 12:10 25 Alexis Gautier v Guilherme Clezar 4-6,4-6
Challenger de Monterrey 03/05 20:30 26 [271] Guilherme Clezar v Kevin King [306] 6-7,6-4,4-6
Challenger de Monterrey 03/04 17:00 25 [103] Federico Coria v Guilherme Clezar [271] 1-6,7-6,6-7
Challenger de Monterrey 03/02 20:00 24 [426] Nicolas Mejia v Guilherme Clezar [271] 1-6,4-6
Challenger de Columbus 02/27 18:45 26 [270] Guilherme Clezar v Denis Istomin [165] 3-6,1-6