The ninth-seeded Fritz rallied from a 4-2 deficit in the opening set and took the second by winning the last four games.
Simona Halep kept alive hopes of regaining the world number one ranking Sunday, beating Polona Hercog 5-7, 7-6 (7/1), 6-2 to reach the last 16 of the WTA and ATP Miami Open.
The 37-year-old Swiss can clinch a record-extending 21st major if he manages to break free of the world number one's stranglehold.
Tennis star Serena Williams has revealed that she has apologised to Japan's Naomi Osaka who defeated her in the finals of the US Open last year.
On this occasion, plenty of surprises are in store for the fans. An interactive competition with the audience will take place, during which a variety of questions will be asked and cash prizes in the amount of Dhs5,000 will be awarded to the winners.
Balooshi leads the rankings by a single point over two of his competitors in this tournament, Portugal's Fabio Magalhaes and Poland's Konrad Dabrowski.
Cameroon finished third on four points, two points below second-placed Switzerland, who defeated Serbia 3-2. Brazil, who had already qualified, finished on top on goal difference with six points and will face South Korea in the last 16.