2018-2019: Big West First Team singles and doubles
Followed up a dominant sophomore campaign with a 23-11 overall record…went 9-4 mainly playing No.2 singles…tallied a 2-2 record from the No.1 singles position…ranked as high as No.20 by the ITA in singles with wins coming in the fall over USC’s, Daniel Cukierman (No.11) and Stanford’s Axel Geller (No.13)…advanced to the Second Round of the NCAA singles championships with a win over UCF's No. 43 Gabriel Decamps…Undefeated in Big West singles play finishing with a 2-0 record…played almost exclusively with Victor Krustev at the No.2 doubles position going 13-6 overall and 10-4 on the second court… clinched the match on court 2 during the NCAA tennis championships first round with a win over Texas Tech’s, No. 102 Tommy Mylnikov 6-4, 6-7 (2), 6-2…Big West First Team honors in singles and doubles.
Joseph Guillin dominated in his first season at UCSB with 19-2 overall record as all of his matches came during dual match season...Went undefeated from the second and third courts going 8-0, 4-0 respectively...Recorded a 3-1 on the first court, 4-1 on the fourth court...Undefeated in Big West Play finishing with a 4-0 record...Six straight wins to cap off season...Excelled in Doubles play goin 13-4 overall, 11-4 while paired up with Victor Kurstev and 2-0 when paired with Hironori Koyanagi...Earned Honorable Mention for Big West Doubles Team while paired with Victor Krustev.
Guillin spent his freshman season at the University of Florida where he went 12-5 in overall singles matches...Undefeated 3-0 record in SEC Singles matches...Primarily played from the sixth court...6-6 in overall doubles matches.
Semifinalist in U-18 French Championships, 2015...Career peak junior ranking was 164...Career peak professional ranking was 1,838...Ranked as high as 15 in France.