Answer
Magdaléna Rybáriková was the player defeated by Garbiñe Muguruza in the 2017 Wimbledon semifinals. Rybáriková, a Slovak tennis player, had a successful run in the tournament, reaching the semifinals after defeating top-seeded Angelique Kerber in the quarterfinals. However, Muguruza, a Spanish tennis player and the eventual Wimbledon champion that year, proved too strong for Rybáriková, defeating her in straight sets to advance to the final.