Poland took a 1-0 lead over Germany in the final of the $10 million United Cup mixed team tournament on Sunday as world number one Iga Swiatek beat Angelique Kerber 6-3 6-0. The top seeds in the tournament that began with 18 nations in contention could clinch the title if Hubert Hurkacz can pull off a victory over Alexander Zverev in the men’s singles match that follows at the Ken Rosewall Arena.