[2] On August 27, 2014, Blatt started his professional career with Hapoel Tel Aviv, signing a four-year deal.

[3] In his first season with Hapoel, Blatt was loaned to A.S. Ramat HaSharon of the Israeli National League, where he averaged 9.7 points, 4.1 assists and 2.5 rebounds per game.

[5] On November 12, 2017, Blatt recorded a career-high 22 points, shooting 6-of-10 from three-point range, along with five rebounds and five assists in a 104–74 blowout win over Maccabi Rishon LeZion.

[8] On July 4, 2018, Blatt signed a two-year deal with Hapoel Jerusalem, joining his former head coach Oded Kattash.

In July 2015, Blatt helped the Israeli under-18 national team to reach the 2015 FIBA Europe Under-18 Championship Division B Final, where they eventually lost to Sweden and earned a silver medal.

On September 18, 2015, Blatt participated in the FIBA European U-18 All-Star Game in France, recording six points and six assists.

[19][20] In July 2017, Blatt led the Israeli under-20 national team to reach the 2017 FIBA Europe Under-20 Championship Final, where they eventually lost to Greece.

On November 24, 2017, he made his first appearance for the senior team at the 2019 FIBA Basketball World Cup qualification match against Estonia, recording nine points and three assists off the bench.