The dollar could extend gains versus the yen if it holds above the 21-day exponential moving average, which is now at 161.00 yen, says Quek Ser Leang of UOB Global Economics & Markets Research in a note. "With USD/JPY in uncharted territory, there are few obvious technical reference points to identify as meaningful resistance," the senior technical strategist says. Hence, "round-number resistance levels may serve as the most practical resistance levels," the strategist says. However, the moving average convergence divergence indicator on the daily chart continues to show a clear negative divergence, suggesting upward momentum is lackluster, the strategist adds. The dollar is 0.1% higher at 162.16 yen, LSEG data show. (ronnie.harui@wsj.com)