Day's first professional team was with the
Algodoneros de la Comarca in
Mexico where he stayed for two years. He stopped playing for a season and a half due to a lack of playing time and a lack of opportunities elsewhere. He returned to professional basketball again in Mexico in the second half of the 2007–08 season with
Caballeros de Culiacan. The following season, he returned to Algodoneros de la Comarca. In the 2009–10 season he signed with
Lobos Grises de la UAD Durango in the hopes of gaining visibility outside of Mexico. After the season, his agent initially arranged for him to participate in a tournament in
China with an Argentine team, but after further negotiations he signed with Brazilian team
Unitri/Uberlândia for 2010–11 NBB season. In his first season in Brazil, Day gained visibility and became known for being extremely dangerous from the three-point line. His great performances earned him a spot in the NBB All-Star Game, held in
Franca, where he played for a team composed of foreign players, called
NBB Mundo (NBB World), against a team composed entirely of Brazilian players. Day started the game on the bench, but when he entered the court, his story began to be written. With a rare performance from the three-point line, Day hit an unbelievable 12 three-pointers and scored an incredible 50 points. NBB World won the match 115–99 and Day was named the MVP of the game. During the season, Robert Day, assisted by
Robby Collum and
Valtinho, led the team to the quarterfinals of the championship, being eliminated by
Brasília of
Alex Garcia,
Guilherme Giovannoni and
Nezinho dos Santos. The following season, Uberlândia emerged as one of the favorites of the NBB. The team had been having a great season, having led a good portion of the regular season, but the departure of
Uruguayan coach
Miguel Volcan in the middle of the season was detrimental to the team, which finished fifth in the first phase. In the playoffs, the team of
Minas Gerais was eliminated by
Flamengo in the quarterfinals. But in the
2012–13 NBB season, with the return of
Helio Rubens Garcia and
Helio Rubens Filho, Robert Day had his best season in Brazil, led the team to the championship final, again facing Flamengo. But this match, played at the
Rio de Janeiro, was canceled. The
Paraguayan
Bruno Zanotti took charge to mark the American, which was fundamental for the title of the team from Rio de Janeiro. After the match, Robert Day was chosen to the
NBB First Team, beside
Fúlvio de Assis,
Marquinhos,
Rafael Mineiro and
Caio Torres. Robert Andrew Day now has 3 kids Lainey (the oldest), Cooper (the middle), and Beckett (the youngest). == Brazilian League statistics ==