When the Newsomes moved to Albuquerque, New Mexico, he attended his secondary education at Rio Rancho High School.

[7] He accepted the offer and spent two years of residency (as per UAAP rules for foreign students) before finally seeing action for Ateneo in 2013.

[10] Newsome suited up for the Hapee Fresh Fighters in the PBA D-League, where he teamed up with fellow college standouts and future draft batchmates Troy Rosario, Baser Amer, Garvo Lanete and Scottie Thompson.

[14] In his PBA debut on October 28, 2015, he finished with a team-high-tying 14 points, including two on a highlight slam dunk over San Miguel's Arwind Santos.

He participated in the PBA All-Star Weekend Slam Dunk Contest, making it to the final round only to lose to two-time defending champion, Rey Guevarra.

Other nominees for the league's newcomer trophy were Maverick Ahanmisi, Arthur dela Cruz, Troy Rosario and Moala Tautuaa.

[17] After a six-game losing streak, he led the team to a win over the Rain or Shine Elasto Painters with 19 points and 6 assists.

[19] That season, he was snubbed from the All-Star Game,[20] but he was able to win his first Slam Dunk title, finishing just one point ahead of James Forrester.

[23] He finished the elimination round with a Player of the Week award, for averaging 21 points, 5.5 rebounds, 5.5 assists and 1 steal in 2 games and securing first place for the Bolts.

[34] In the 2020 Philippine Cup, Newsome hit a buzzer-beating, baseline fadeaway jumper to give Meralco the win over the Terrafirma Dyip.

[37] During the 2021 Philippine Cup, Newsome, along with teammate Cliff Hodge, was placed into the league's health and safety protocols, forcing them to miss two games.

[42] The Bolts finally put Magnolia away in Game 5, as he scored 18 points (11 in the fourth quarter), 12 assists, eight rebounds, three steals, and a block.

[46] Along with teammates CJ Perez, Jason Perkins, and Moala Tautuaa, they helped the Philippines claim gold for that event, sweeping the tournament in the process.