Crossword puzzle clue "open up as a topic"

Wanders from topic to topic in conversation

Open up, as a topic

“And I could barely keep my eyes open in Economics, where the topic of the day was ___”

Rare occurrence at the U.S. Open on Father's Day that's a common occurrence at the U.S. Open on Labor Day

US Open and French Open feats

2004 French Open and U.S. Open runner-up Dementieva

Woman who won the Australian Open and US Open in 1997 without losing a set: 2 wds.

Tennis player who has won an Open Era record six women's singles titles at the Australian Open: 2 wds.