diff --git a/components/merino/src/worldcup/http.rs b/components/merino/src/worldcup/http.rs
index 897636c8bd..b16de88b10 100644
--- a/components/merino/src/worldcup/http.rs
+++ b/components/merino/src/worldcup/http.rs
@@ -14,6 +14,7 @@ pub struct WorldCupQueryParams {
     pub limit: Option<u32>,
     pub teams: Option<String>,
     pub accept_language: Option<String>,
+    pub date: Option<String>,
 }
 
 pub trait HttpClientTrait {
@@ -27,7 +28,7 @@ impl HttpClientTrait for HttpClient {
 }
 
 pub fn build_url(endpoint_url: Url, params: &WorldCupQueryParams) -> Url {
-    if params.limit.is_none() && params.teams.is_none() {
+    if params.limit.is_none() && params.teams.is_none() && params.date.is_none() {
         return endpoint_url;
     }
     let mut url = endpoint_url;
@@ -39,6 +40,9 @@ pub fn build_url(endpoint_url: Url, params: &WorldCupQueryParams) -> Url {
         if let Some(v) = &params.teams {
             pairs.append_pair("teams", v);
         }
+        if let Some(v) = &params.date {
+            pairs.append_pair("date", v);
+        }
     }
     url
 }
@@ -112,6 +116,7 @@ mod tests {
             limit: Some(5),
             teams: Some("FRA,ENG".to_string()),
             accept_language: Some("en-GB".to_string()),
+            date: None,
         };
         let url = build_url(base_url(), &options);
         assert!(has_param(&url, "limit", "5"));
@@ -131,6 +136,7 @@ mod tests {
             limit: Some(3),
             teams: Some("FRA".to_string()),
             accept_language: Some("en-US".to_string()),
+            date: None,
         };
         let url = build_url(base_url(), &options);
         assert_eq!(
diff --git a/components/merino/src/worldcup/mod.rs b/components/merino/src/worldcup/mod.rs
index cc078718ed..9c80ff2c11 100644
--- a/components/merino/src/worldcup/mod.rs
+++ b/components/merino/src/worldcup/mod.rs
@@ -117,6 +117,7 @@ impl<T: http::HttpClientTrait> WorldCupClientInner<T> {
             limit: options.limit,
             teams,
             accept_language: options.accept_language,
+            date: options.date,
         }
     }
 
diff --git a/components/merino/src/worldcup/schema.rs b/components/merino/src/worldcup/schema.rs
index 1976a9a434..70e32c6149 100644
--- a/components/merino/src/worldcup/schema.rs
+++ b/components/merino/src/worldcup/schema.rs
@@ -15,4 +15,6 @@ pub struct WorldCupOptions {
     pub teams: Option<Vec<String>>,
     /// Language for results (e.g. `"en-US"`). (Not supported yet)
     pub accept_language: Option<String>,
+    /// ISO 8601 date string to filter matches by date (e.g. `"2026-06-14"`).
+    pub date: Option<String>,
 }
diff --git a/components/merino/src/worldcup/tests.rs b/components/merino/src/worldcup/tests.rs
index e7071d6afe..616e9a9344 100644
--- a/components/merino/src/worldcup/tests.rs
+++ b/components/merino/src/worldcup/tests.rs
@@ -29,6 +29,7 @@ fn default_options() -> WorldCupOptions {
         limit: None,
         teams: None,
         accept_language: None,
+        date: None,
     }
 }
 
@@ -162,6 +163,7 @@ fn test_accept_language_is_passed_as_header() {
             limit: None,
             teams: None,
             accept_language: Some("en-US".to_string()),
+            date: None,
         },
     );
     let response = result.unwrap().unwrap();
@@ -212,6 +214,7 @@ fn test_matches_endpoint_url_with_limit() {
             limit: Some(2),
             teams: None,
             accept_language: None,
+            date: None,
         },
     );
     let captured = captured_url.lock().unwrap();
@@ -246,3 +249,25 @@ fn test_builder_fails_with_invalid_base_host() {
         Ok(_) => panic!("Expected error for invalid base_host"),
     }
 }
+
+#[test]
+fn test_matches_endpoint_url_with_date() {
+    let captured_url = std::sync::Arc::new(std::sync::Mutex::new(None::<Url>));
+    let client_inner = WorldCupClientInner::new_with_client(FakeCapturingClient {
+        captured_url: captured_url.clone(),
+    });
+    let _ = client_inner.make_request(
+        base_url().join("matches").unwrap(),
+        WorldCupOptions {
+            limit: None,
+            teams: None,
+            accept_language: None,
+            date: Some("2026-06-14".to_string()),
+        },
+    );
+    let captured = captured_url.lock().unwrap();
+    assert_eq!(
+        captured.as_ref().unwrap().as_str(),
+        "https://merino.services.mozilla.com/api/v1/wcs/matches?date=2026-06-14"
+    );
+}
diff --git a/examples/merino-cli/src/main.rs b/examples/merino-cli/src/main.rs
index 486788bcc5..1bd22286f7 100644
--- a/examples/merino-cli/src/main.rs
+++ b/examples/merino-cli/src/main.rs
@@ -99,6 +99,9 @@ enum Commands {
         /// Language for results (e.g. "en-US")
         #[arg(long)]
         accept_language: Option<String>,
+        /// Date to filter matches by, in `YYYY-MM-DD` format (e.g. "2026-06-14")
+        #[arg(long)]
+        date: Option<String>,
 
         #[command(subcommand)]
         endpoint: WorldCupEndpoint,
@@ -186,6 +189,7 @@ fn main() -> Result<()> {
             limit,
             teams,
             accept_language,
+            date,
             endpoint,
         } => {
             let client = WorldCupClient::new(WorldCupConfig {
@@ -195,6 +199,7 @@ fn main() -> Result<()> {
                 limit,
                 teams,
                 accept_language,
+                date,
             };
             let result = match endpoint {
                 WorldCupEndpoint::Teams => client.get_teams(options),