Prediction for the match between Tomas Machac and Zhang Zhizhen: Considering their current form and results, the preference is for Zhang Zhizhen. Machac has not been showing his best game since the third round of the French Open, losing in several tournaments. Meanwhile, Zhang has been showing improvement on clay, reaching the third round in Paris for two consecutive years. Taking this into account, Zhang's victory at odds of 2.11 could be an interesting choice for a bet.