[2] Mashour helped Emek Yizra'el reach the Youth State Cup Finals in 2009, while averaging 21.6 points and 6.0 rebounds per game.

[4] Mashour finally played a full season in 2014–15, appearing in 34 games for the Eagles while receiving 27 starting assignments.

[3] On July 29, 2015, Mashour started his professional career with Bnei Herzliya, signing a one-year deal with an option for another one.

[5][6] On December 26, 2015, Mashour recorded a career-high 25 points, shooting 11-of-17 from the field, along with seven rebounds and three steals in a 74–102 blowout loss to Maccabi Tel Aviv.

[9] On November 12, 2016, Mashour recorded a double-double of 16 points and 17 rebounds, along with four assists, leading Herzliya to an 84–82 win over Maccabi Tel Aviv.

[10] Mashour helped Herzliya reach the 2017 Israeli League Playoffs as the fifth seed, but they eventually were eliminated by Maccabi Tel Aviv in the Quarterfinals.

[12] On January 13, 2018, Mashour recorded a season-high 17 points, shooting 5-of-8 from the field, along with seven rebounds in a 90–86 win over his former team Bnei Herzliya.

[14][15] On December 8, 2018, Mashour recorded 22 points, shooting 9-of-17 from the field, along with eight rebounds and four steals, leading Herzliya to a 105–78 win over Hapoel Gilboa Galil.