In January 2019, Osuigwe played alongside David Ferrer on the Spain team in the 2019 Hopman Cup, replacing Garbiñe Muguruza who was out due to injury. Osuigwe played only the mixed-doubles match, losing to the French team which consisted of Lucas Pouille and Alizé Cornet. In March, she entered the Miami Open main draw as a wildcard, winning her first-round match against fellow wildcard Mari Osaka, the sister of Naomi Osaka.