2. McDonald gets second look, Fox and Colaprico debut.
The USA had plenty of chances but didn't do well with its finishing. McDonald, who missed an open chance earlier in the first half, scored the only goal when she followed up on her shot stopped by Portuguese keeper Patricia Morais and put away the rebound.
McDonald was playing only her second game for the USA, while University of North Carolina sophomore Emily Fox and Chicago Red Stars midfielder Danielle Colaprico earned their first caps.
McDonald and Fox were among four starters not in Jill Ellis' lineup she went with throughout most of qualifying. Andi Sullivan played her first game for the USA since April, starting in midfield with Lindsey Horan and Rose Lavelle, while Mallory Pugh got the start on the right wing in place of Tobin Heath, who did not travel to Europe.
3. U.S. defense holds tight again.
Portugal's 13 shots were only one less than the USA faced in all five games combined at the Concacaf Women's Championships. But keeper Alyssa Naeher needed to make only two saves to earn her ninth shutout of 2018 and extend the USA's shutout streak to 794 minutes, dating back to the Tournament of Nations in August.
The USA is just too strong down the spine with Becky Sauerbrunn and Abby Dahlkemper behind Julie Ertz (a late sub against Portugal) and Horan to give opponents many quality opportunities.
Trivia. The win extended the USA's record in 2018 to 17-0-2.
Nov. 8 in Estoril
Portugal 0 USA 1. Goal: McDonald 42.
Portugal -- Morais; Fidalgo, Rebelo, Carole, M.Mendes; Marques, T.Pinto (F.Pinto, 86), Dolores Silva, Diana Silva, C.Mendes (Norton, 63), J.Silva (Leite, 86).
USA -- Naeher; Fox (Lloyd, 63), Dahlkemper, Sauerbrunn, Dunn; Sullivan (Colaprico, 46), Lavelle (Ertz, 82), Horan; Pugh (Sonnett, 73), McDonald (Morgan, 46), Rapinoe.
USA / POR
Shots: 13 / 13
Shots on Goal: 5 / 4
Saves: 2 / 4
Corner Kicks: 7 / 3
Fouls: 13 / 15
Offside: 4 / 2