But that just meant some of USA's other stars were able to shine.
Christen Press, who impressed throughout the World Cup, fed the ball to Heath – who opened the scoring in the 16th minute.
Samantha Mewis and Lindsey Horan quickly partnered up for the next goal – the latter doubling the advantage just past the half-hour mark with a tap-in.
Lloyd capped off the team's scoring four minutes before half-time after the veteran looped a header over the Ireland goalkeeper.
Next up, USA will face Portugal in Philadelphia on August 29.