Castellano earned a spot in the main singles draw while Keberle was selected for the pre-qualifying singles draw. The duo also earned a spot in the qualifying doubles tournament.
The tournament begins on Sept. 29 with pre-qualifying matches. Qualifying singles and doubles matches follow on Oct. 2-3 and the main draw runs Oct. 4-7.
Invitees are not only competing for an All-American title but also a potential berth to the 2018 OracleITA National Fall Championships.
Castellano is coming off a semifinal appearance in singles at the Milwaukee Tennis Classic and won the ITA Summer Nationals tournament in August. A first-team All-Big Ten selection last year, Keberle went 25-10 as a freshman last year.
Castellano and Keberle competed in doubles together nine times in the 2017-18 season, going 6-3 overall. The pair logged two dual wins in doubles play, held a 4-1 record in tournament play and went 1-2 in conference play. In those nine matches, Castellano and Keberle were 2-1 against nationally ranked opponents. The duo also finished second at the ITA Summer Nationals.