See https://developer.yahoo.com/fantasysports/guide/ for details.

team_matchups_example.xml

<!--https://fantasysports.yahooapis.com/fantasy/v2/team/223.l.431.t.1/matchups;weeks=1,5-->
<!--Team matchups for weeks 1 and 5 in a NFL H2H league-->
<?xml version="1.0" encoding="UTF-8"?>
<fantasy_content xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" xmlns="http://fantasysports.yahooapis.com/fantasy/v2/base.rng" xml:lang="en-US" yahoo:uri="http://fantasysports.yahooapis.com/fantasy/v2/team/223.l.431.t.1/matchups;weeks=1,5" time="576.54285430908ms" copyright="Data provided by Yahoo! and STATS, LLC">
  <team>
    <team_key>223.l.431.t.1</team_key>
    <team_id>1</team_id>
    <name>PFW - Blunda</name>
    <url>https://football.fantasysports.yahoo.com/archive/pnfl/2009/431/1</url>
    <team_logos>
      <team_logo>
        <size>medium</size>
        <url>https://l.yimg.com/a/i/us/sp/fn/default/full/nfl/icon_01_48.gif</url>
      </team_logo>
    </team_logos>
    <division_id>2</division_id>
    <faab_balance>22</faab_balance>
    <managers>
      <manager>
        <manager_id>13</manager_id>
        <nickname>Michael Blunda</nickname>
        <guid>XNAXQZRDZPJ3RVFMY7ZTSWEFLU</guid>
      </manager>
    </managers>
    <matchups count="2">
      <matchup>
        <week>1</week>
        <status>postevent</status>
        <is_tied>0</is_tied>
        <winner_team_key>223.l.431.t.1</winner_team_key>
        <teams count="2">
          <team>
            <team_key>223.l.431.t.1</team_key>
            <team_id>1</team_id>
            <name>PFW - Blunda</name>
            <url>https://football.fantasysports.yahoo.com/archive/pnfl/2009/431/1</url>
            <team_logos>
              <team_logo>
                <size>medium</size>
                <url>https://l.yimg.com/a/i/us/sp/fn/default/full/nfl/icon_01_48.gif</url>
              </team_logo>
            </team_logos>
            <division_id>2</division_id>
            <faab_balance>22</faab_balance>
            <managers>
              <manager>
                <manager_id>13</manager_id>
                <nickname>Michael Blunda</nickname>
                <guid>XNAXQZRDZPJ3RVFMY7ZTSWEFLU</guid>
              </manager>
            </managers>
            <team_points>
              <coverage_type>week</coverage_type>
              <week>1</week>
              <total>117.88</total>
            </team_points>
            <team_projected_points>
              <coverage_type>week</coverage_type>
              <week>1</week>
              <total>107.94</total>
            </team_projected_points>
          </team>
          <team>
            <team_key>223.l.431.t.5</team_key>
            <team_id>5</team_id>
            <name>RotoExperts</name>
            <url>https://football.fantasysports.yahoo.com/archive/pnfl/2009/431/5</url>
            <team_logos>
              <team_logo>
                <size>medium</size>
                <url>https://a323.yahoofs.com/coreid/49be42a6i26e5zul3re3/d2x_9_UweKP95SJZ_Hwnk2Rl/2/tn48.jpg?ciA8DVOBIRa6b7wq</url>
              </team_logo>
            </team_logos>
            <division_id>2</division_id>
            <faab_balance>1</faab_balance>
            <clinched_playoffs>1</clinched_playoffs>
            <managers>
              <manager>
                <manager_id>12</manager_id>
                <nickname>Scott</nickname>
                <guid>RW3ELDFMOFTES2EUAWQVCPPN7E</guid>
              </manager>
            </managers>
            <team_points>
              <coverage_type>week</coverage_type>
              <week>1</week>
              <total>103.82</total>
            </team_points>
            <team_projected_points>
              <coverage_type>week</coverage_type>
              <week>1</week>
              <total>110.41</total>
            </team_projected_points>
          </team>
        </teams>
      </matchup>
      <matchup>
        <week>5</week>
        <status>postevent</status>
        <is_tied>0</is_tied>
        <winner_team_key>223.l.431.t.1</winner_team_key>
        <teams count="2">
          <team>
            <team_key>223.l.431.t.1</team_key>
            <team_id>1</team_id>
            <name>PFW - Blunda</name>
            <url>https://football.fantasysports.yahoo.com/archive/pnfl/2009/431/1</url>
            <team_logos>
              <team_logo>
                <size>medium</size>
                <url>https://l.yimg.com/a/i/us/sp/fn/default/full/nfl/icon_01_48.gif</url>
              </team_logo>
            </team_logos>
            <division_id>2</division_id>
            <faab_balance>22</faab_balance>
            <managers>
              <manager>
                <manager_id>13</manager_id>
                <nickname>Michael Blunda</nickname>
                <guid>XNAXQZRDZPJ3RVFMY7ZTSWEFLU</guid>
              </manager>
            </managers>
            <team_points>
              <coverage_type>week</coverage_type>
              <week>5</week>
              <total>140.00</total>
            </team_points>
            <team_projected_points>
              <coverage_type>week</coverage_type>
              <week>5</week>
              <total>110.85</total>
            </team_projected_points>
          </team>
          <team>
            <team_key>223.l.431.t.7</team_key>
            <team_id>7</team_id>
            <name>RotoWire_Liss</name>
            <url>https://football.fantasysports.yahoo.com/archive/pnfl/2009/431/7</url>
            <team_logos>
              <team_logo>
                <size>medium</size>
                <url>https://l.yimg.com/a/i/us/sp/fn/default/full/nfl/icon_10_48.gif</url>
              </team_logo>
            </team_logos>
            <division_id>2</division_id>
            <faab_balance>68</faab_balance>
            <managers>
              <manager>
                <manager_id>7</manager_id>
                <nickname>RotoWire_Liss</nickname>
                <guid>4BDB5LIG3IFVROH7SRBX44LBZM</guid>
              </manager>
            </managers>
            <team_points>
              <coverage_type>week</coverage_type>
              <week>5</week>
              <total>86.47</total>
            </team_points>
            <team_projected_points>
              <coverage_type>week</coverage_type>
              <week>5</week>
              <total>88.14</total>
            </team_projected_points>
          </team>
        </teams>
      </matchup>
    </matchups>
  </team>
</fantasy_content>