The girls' tennis team has won the Group I title in 1978 (defeating Chatham Township High School in the finals), Group II in 1999 (vs. Chatham High School), 2014 (vs. Summit High School), 2015 (vs. Ramapo High School), 2016 (vs. Haddonfield Memorial High School), 2017 (vs. Haddonfield) and 2018 (vs. Northern Valley Regional High School at Demarest) and won in Group III in 2005 (vs. Wall High School); the program's seven state titles are tied for tenth-most in the state. Holmdel won the Tournament of Champions in 2005 against runner-up Westfield High School. The 1978 team won the Group I state title in the tournament final at Princeton University with a 4-1 win against a Chatham Township team that beat Holmdel 4-1 the previous year. The 1999 team won against Pascack Hills High School 4-1 in the semis and defeated Chatham 3-2 in the tournament finals at Mercer County Park. The team won the program's fifth consecutive Group II title with a 3-2 win in 2018 against Northern Valley at Demarest.