Grinwis joined Orlando City after featuring for Saint Louis FC in the 2017 United Soccer League (USL) season. The third-year pro made 61 saves in 14 appearances and registered five clean sheets in 2017. Grinwis spent 2015 and 2016 with the Rochester Rhinos and helped the Rhinos to the 2015 USL regular season title and USL Cup.
The Ada, Mich., native played 68 games over four years for the University of Michigan. Grinwis was named Michigan Club Man of the Year as a fifth-year senior in 2014, and was a Second Team All-Big Ten and All-Big Ten Tournament selection in 2012. Grinwis finished his career with the second-most career saves (261) and shutouts in a season (6).