In Oftana's first game of the 2023 Governors' Cup, he had 17 points and seven rebounds in a win over Phoenix. After missing a game due to health protocols, he had a double-double of 14 points and 10 rebounds to help TNT take the win over Magnolia. Against the San Miguel Beermen, he had 14 points, six assists, and 10 rebounds, with the last rebound allowing him to make the game-winning putback basket. This allowed him to receive Player of the Week honors and placed TNT at the top of the standings for the conference. He also made it into the PBA All-Star Game as a replacement for Terrence Romeo. In the semifinals, he had 21 first half points in Game 4 against Meralco to send TNT back to the Finals. In his Finals debut, he had 16 points on 7-of-11 shooting, but still lost to Barangay Ginebra. He then had a double-double of 14 points and 13 rebounds as TNT tied the series in Game 2. In Game 5, he stepped up for injured RR Pogoy with 20 points on four triples as TNT took a 3–2 series lead. He was able to win his first PBA championship in the following game.
