ใครคือคู่ต่อสู้บนพื้นดินเมื่อร่วมมือกับ Horacio Zeballos?
Who was the opponent on clay surface when partnered with Horacio Zeballos?
df = pd.DataFrame(columns=['opponents', 'surface', 'partnering'])
df[(df['surface'] == 'clay') & (df['partnering'] == 'horacio zeballos')]['opponents']