PRAGUE (Reuters) - Slovak Prime Minister Robert Fico and Andrej Kiska won the most votes in the first round of a presidential election on Saturday, setting up a run-off that will either cement the ruling party's power or usher in an independent.

A Fico victory in a second-round vote on March 29 would give his centre-left Smer party full control of all the main power centers, even if the Slovak constitution does not grant the president himself a huge political role.

With 99 percent of the vote counted, Fico had won 28 percent, less than expected, while Kiska garnered 24 percent.

(Reporting by Jason Hovet; Editing by Lisa Shumaker)