from typing import List
from typing import Tuple


def filter_releases_by_version(releases: List[Tuple[str, List[Tuple[str, int]]]], tag: str) -> List[Tuple[str, List[Tuple[str, int]]]]:
    """
    Keep only the release with the provided tag name

    :param releases
    :param tag
    :returns list
    """
    return list(filter(lambda x : x[0] == tag, releases))