Simona Halep

Americans off to quick start at Australian Open

Shelby Rogers thoroughly dominated the No. 4 player in the world, Simona Halep. A teary-eyed CoCo Vandeweghe battled nausea to outlast another top-20 veteran, Roberta Vinci.

And the grande dame of the women's tour, 36-year-old Venus Williams, refused to cede the spotlight for at least another match at the Australian Open, beating Kateryna Kozlova in the first round of her 73rd career Grand Slam tournament, an Open-era record.

It's been a fast start for many of the 32 Americans in the men's and women's singles draw in Melbourne — both the old guard and the unproven youngsters of the next generation. Thirteen won their first-round matches on Monday, compared to six...