As a freshman at Iona, Machado led the Gaels in points scored, set a school record for assists by a freshman and was named the Metro Atlantic Athletic Conferencerookie of the year. As a sophomore, he averaged 12.5 points and 3.9 assists, leading the Gaels to a 21-win season. He was selected second team All-Conference. As a junior, Machado broke out, averaging 13.2 points and 7.6 assists per game. He set a school record for assists in a season and was named first team all-conference. As a senior, Machado broke the school record for assists in the first game of the season and broke Siena's Ronald Moore's MAAC record in a February 18 game against Nevada. After emerging as one of the top point guards in the country, he was named a finalist for the Bob Cousy Award and the Wooden Award.
Professional career
2012–13 season
After going undrafted in the 2012 NBA draft, Machado joined the Houston Rockets for the 2012 NBA Summer League. In five games, he averaged 8.0 points, 5.6 assists and 2.2 rebounds per game. On September 7, 2012, he signed with the Rockets. On November 14, 2012, Machado was assigned to the Rio Grande Valley Vipers of the NBA Development League. On November 26, 2012, he was recalled by the Rockets. Two days later, he made his NBA debut with the Rockets, recording two points and one assist in a 98-120 loss to the Oklahoma City Thunder. On November 30, 2012, he was reassigned to the Vipers. On December 22, 2012, he was recalled by the Rockets. On January 7, 2013, he was waived by the Rockets. On January 29, 2013, Machado was acquired by the Vipers. On March 8, 2013, he was traded to the Santa Cruz Warriors in exchange for Chris Daniels and a second-round draft pick. On April 7, 2013, Machado signed a 10-day contract with the Golden State Warriors. The next day, he was assigned back to Santa Cruz. On April 17, 2013, he signed with Golden State for the rest of the season. Machado stayed with the Santa Cruz Warriors for the team's D-League playoff run until Santa Cruz lost the best-of-three 2013 NBA D-League Finals series to the Rio Grande Valley Vipers on April 26. Two days later, he returned to Golden State and made his debut in Game 4 of the Warriors' first-round series against the Denver Nuggets, recording two points and one rebound in the Warriors' 115-101 victory.
2013–14 season
In July 2013, Machado joined the Golden State Warriors for the 2013 NBA Summer League. On July 24, 2013, he was waived by the Warriors. On September 26, 2013, he signed with the Utah Jazz. However, he was later waived by the Jazz on October 26, 2013. On January 14, 2014, he was re-acquired by the Santa Cruz Warriors. On February 26, 2014, he was traded to the Idaho Stampede. On April 7, 2014, he signed with ASVEL Basket of France for the rest of the 2013–14 LNB Pro A season.
On August 7, 2016, Machado signed with Rasta Vechta of Germany for the 2016–17 season. On December 5, 2016, he parted ways with Vechta. Eight days later, he signed with Spanish club ICL Manresa for the rest of the 2016–17 ACB season. In its second game in Spain, its first at home, Machado scored a winning layup against Movistar Estudiantes.
2017-18 season
Machado signed with the South Bay Lakers for the 2017/18 season. Where he played in 46 games, averaging 15.9 points, 8.7 assists, 3.8 rebounds and 1.0 steals in 31.4 minutes per game.
2018-19 season
On October 12, 2018, Machado signed with the Los Angeles Lakers, but was waived a day later. He subsequently signed with the Lakers' G League affiliate, the South Bay Lakers. On March 21, 2019, Machado signed a 10-day contract with the Los Angeles Lakers. He had a career high 7 points and 3 assists on March 27 against the Utah Jazz.
2019–20 season
On August 9, 2019, Machado signed with the Cairns Taipans in Australia for the 2019–20 NBL season. He was named to the First Team All-NBL.
In the summer of 2017, Machado competed in The Basketball Tournament on ESPN for Team Fancy. In three games, he averaged 13.7 points, 5.0 rebounds, 3.3 steals and 3.0 assists per game to help lead his team to the Super 16 Round where they lost 65-61 to Boeheim's Army; a team composed of Syracuse University basketball alum. In TBT 2018, Machado suited up for Gael Nation. In 2 games, he averaged 11.5 points, 4.5 assists, and 6 rebounds per game. Gael Nation reached the second round before falling to Armored Athlete.
Machado is the son of Brazilian parents Luiz and Solenir Machado. As a child, Machado started referring to himself by his middle name "Scott" instead of his birth name "Michael" after his childhood favourite team, the New York Knicks, were constantly beaten in the playoffs by Michael Jordan and the Chicago Bulls.