What is the fine-grained topic of the following text: Losing a ball on the 10th hole on Saturday in the third round of the Zanako Masters at Lusaka Golf Club was not enough to stop JC Ritchie storming to a two-stroke lead with a superb seven-under-par 66. Only return the topic.
JC Ritchie taking a two-stroke lead in the third round of the Zanako Masters at Lusaka Golf Club