diff --git a/sentry_sdk/tracing.py b/sentry_sdk/tracing.py
index df59d222f2..735ebd6021 100644
--- a/sentry_sdk/tracing.py
+++ b/sentry_sdk/tracing.py
@@ -130,7 +130,15 @@ def __init__(
         start_timestamp=None,  # type: Optional[datetime]
     ):
         # type: (...) -> None
-        self.trace_id = trace_id or uuid.uuid4().hex
+        if trace_id:
+            self.trace_id = trace_id
+        elif hub:
+            traceparent = hub.get_traceparent()
+            if traceparent:
+                self.trace_id = traceparent.split("-")[0]
+        if not self.trace_id:
+            self.trace_id = uuid.uuid4().hex
+
         self.span_id = span_id or uuid.uuid4().hex[16:]
         self.parent_span_id = parent_span_id
         self.same_process_as_parent = same_process_as_parent