[3] While playing for the basketball team he averaged 19.1 points, 7.6 assists, 4.1 rebounds and 4.1 steals per game[2] and was a first-team all-state selection[4] and District III Player of the Year.
[6][8] In his sophomore season Guice entered the starting lineup, and received increased playing time, a team-high 37.3 minutes per game.
[8] Guice's senior season saw him again being named the team captain,[11] and he averaged career-highs in all shooting categories (his free throw percentage of 77.4 led the conference), and a career high in points per game with 18.2, which made him the 4th best scorer in the MCC.
He joined the Indiana Pacers rookie free agent camp in July 1994[18] and practiced with the team[19] but he was not included in the final roster.
[21] In 1995 Guice moved to Europe and joined Portuguese team Atlético Clube de Portugal, where he averaged 21.4 points per game before coming back to the United States, joining the Connecticut Pride in the CBA, where he averaged 5 points per game in 4 appearances, and then signed with the Shreveport Storm in Shreveport, Louisiana, where he received limited playing time (8.2 minutes) and averaged 2.2 points per game.
[21] In 1999 he played with Ironi Hadera of the Israeli second tier, and he then joined the Trenton Shooting Stars of the International Basketball Association in November 2000.
[23] At the end of the season Guice won the Pro A title with Le Mans, along with the Semaine des As.
In 2006 Guice was signed by Élan Chalon, where he again had the chance to compete in the ULEB Cup: in the 2007–08 edition he played 12 games with averages of 5.8 points, 3.8 rebounds and 3.3 assists.