The U.S. takes the lead in Group A as Guatemala and Jamaica played to a scoreless draw earlier in the day.
The U-20 WNT will now face Jamaica on Saturday, Jan. 11, at Truman Bodden Sports Complex. The game kicks off at 7:30 p.m. ET and will be broadcast live on FOX Soccer Plus and FOX Soccer 2GO (Click here for details on how to access FOX Soccer 2GO matches for free). Fans can also follow the U-20s throughout the tournament on Twitter @ussoccer_ynt.
Summer Green got into the scoring act by finishing a superb slip pass from Horan's into the right corner of the six-yard box. Green calmly placed her low shot to the far left of the frame to take a 4-0 lead in the 61st minute.
In the 81st minute, Savannah Jordan beat the Costa Rican goalkeeper at the near right post with a high-octane shot in the upper corner for a 4-0 lead. Green earned the assist from the right flank after she worked the ball free and fed Jordan inside the penalty area.
The USA improved to 7-0-0 all-time in CONCACAF qualifying tournament openers at this age group (U-19 in 2002, 2004 and 2006; U-20 in 2008, 2010, 2012 and 2014).
The USA improved to 4-0-1 all-time against Costa Rica in this tournament.
The U.S. has now outscored Costa Rica by a 26-2 margin in qualifying games.
The USA is 26-2-1 all-time in the CONCACAF U-19/U-20 Championship and holds an 11-game winning streak dating back to the opener of the 2010 CONCACAF Women's U-20 Championship in Guatemala.
Group B opens the tournament on Friday, with Honduras facing Trinidad & Tobago and host Cayman Islands taking on Mexico.
The two finalists and the winner of the third-place game in the 2014 CONCACAF Women's U-20 Championship advance to the 2014 FIFA U-20 World Cup later this year in Canada.
Match: U.S. U-20 Women's National Team vs. Costa Rica
Date: Jan. 9, 2014
Competition: CONCACAF Women's U-20 Championship - Group A
Venue: Truman Bodden Sports Complex; George Town, Cayman Islands
Kickoff: 7:30 p.m. ET
Weather: 79 degrees, humid
Scoring Summary: 1 2 F
USA 3 3 6
CRC 0 0 0
USA - Lindsey Horan (Andi Sullivan) 13th minute
USA - Lindsey Horan (Makenzy Doniak) 24
USA - Lindsey Horan (Morgan Andrews) 45+2
USA - Summer Green (Lindsey Horan) 61
USA - Savannah Jordan (Summer Green) 81
USA - Lindsey Horan (Savannah Jordan) 86
USA: 1-Katelyn Rowland; 19-Andi Sullivan, 2-Maddie Bauer (14-Rachel Hill, 46), 20-Katie Naughton, 4-Brittany Baysinger; 3-Cari Roccaro (capt.), 7-Morgan Andrews, 17-Rose Lavelle (16-Stephanie Amack, 70); 6-Mackenzy Doniak (5-Summer Green, 55), 9-Lindsey Horan, 13-Savannah Jordan
Subs Not Used: 8-Lauren Kaskie, 10-Laura Liedle, 11-McKenzie Meehan, 12-Mallory Weber, 15-Margaret Purce, 18-Jane Campbell.
Head Coach: Michelle French
CRC: 13-Mariela Vasquez; 3-Noelle Sanz, 2-Yesmi Rodriguez, 5-Paula Coto, 8-Mariana Benavidez Arguedas (capt.); 7-Melissa Herrera, 4-Viviana Chinchilla; 14-Raquel Matarrita (12-Kimberly Lazaro, 57), 20-Krista Chavarria Hernandez (11-Katheryn Arroyo, 76), 10-Gloriana Villalobos Vega, 9-Michelle Montero (15-Nicole Pamela Araya Munoz, 45+1)
Subs Not Used: 1-Noelia Bermudez, 6-Michelle Rodriguez, 16-Maria Brenes, 17-Jazmin Elizondo, 18-Mauren Arroyo, 19-Lauren Alpizar Mora
Head Coach: Garabet Avedissian Derdjian
Stats Summary: USA / CRC
Shots: 25 / 3
Shots on Goal: 12 / 1
Saves: 1 / 5
Corner Kicks: 9 / 0
Fouls: 13 / 9
Offside: 3 / 0
USA - Katelyn Rowland (caution) 40th minute
CRC - Melissa Herrera (caution) 65
Referee: Melissa Borja (HON)
Assistant Referee 1: Leonardo Milagros (DOM)
Assistant Referee 2: Wendy Fisher (CAY)
Fourth Official: Carol Anne Chenard (CAN)
ussoccer.com Woman of the Match: Lindsey Horan